13 ms·

Philae comet lander wakes up

922 points by DangerousPie 11y ago

orf 11y ago
When I'm feeling particularly melancholy I tell myself that none of the apps I've made are ever going to outlive me, and they really don't matter in the scheme of things. But this... this is cool. Someone somewhere has programmed that lander so that it's able to not only able to locate earth (whilst hurtling through god knows where on a big rock) but also successfully re-establish communications. Those developers must be having a good day today, finally seeing their work come to fruition.
- deleted 11y ago
  [deleted]
- pja 11y ago
  I believe the lander is communicating via the Rosetta probe which is relaying its data to earth. (This design meant that Philea needs to dedicate very little power to radio transmissions.) It’s still awesome though :)
kartikkumar 11y ago
Wowoweeeee! This is FANTASTIC news! One of the few times that I have felt like typing in all caps. Incredible news and a testament to the survivability of space hardware. It'll be interesting to see how quickly they can triangulate Philae's true position to better understand the amount of incident light reaching the solar panels. It'll also be interesting to see how much of the payload has survived. Any more data would be of huge scientific value! Definitely made my day! :) EDIT: fixed typo
- aaggarwal 11y ago
  Yes, amazing news, I am waiting for more data to come in to analyze the comet surface and the condition of the lander. This is obviously one the biggest achievement of modern space missions and ESA.
  - kartikkumar 11y ago
    Here's a little bit more info on the nature of the signal received: http://blogs.esa.int/rosetta/2015/06/14/rosettas-lander-philae-wakes-up-from-hibernation/ http://blogs.esa.int/rosetta/2015/06/14/rosettas-lander-phil... 24W is pretty good. More data on the instrumentation onboard can be found in DLR's fact sheet [1]. So I'm guessing if the hardware has survived, we should see some more science data trickling in. Fingers crossed! [1] http://www.dlr.de/dlr/Portaldata/1/Resources/documents/Philae_Lander_FactSheets.pdf http://www.dlr.de/dlr/Portaldata/1/Resources/documents/Phila...
    - aaggarwal 11y ago
      Yes, the power is pretty good. The temperature is currently told as -35 degree Celsius. I wonder how fast would the temperature variations be, with respect to the movement of the comet and how the lander with adjust to that.
      - INTPenis 11y ago
        That temperature made me think that humans could survive there if only they were sheltered from the vacuum and radiation of space. I expected the temperature to be much lower, could this temperature be on the sunny side?
        aaggarwal 11y ago
        I am also surprised. I guess its because the comet is near perihelion.
  - aidanhs 11y ago
    Also an impressive achievement on the software side of things - no room for showstopper bugs here! It's not quite as simple as taking it offline, deploying some new code and starting it up again. Is there any information on the processes used to have such a high level of confidence in the software? Lots of simulation? Relatedly, it might also be interesting to see a list of 'known bugs' and ways they've been worked around.
JohnHammersley 11y ago
Woo hoo! What amazing news, especially given the difficulties during the landing. For those who didn't see the original coverage, you can see some brilliant photos of the bounce the lander made during it's landing on the comet here: http://www.space.com/27788-philae-comet-landing-bounce-photos.html http://www.space.com/27788-philae-comet-landing-bounce-photo... Also a hat tip to the earlier missions (such as the Beagle probe that was lost on Mars) which emphasized the importance of retaining radio contact for as long as possible during landing and being able to send and receive commands with the minimum amount of hardware reconfiguration once landed. What a fantastic start to Sunday!
benihana 11y ago
Oh my goodness I cannot image the excitement the Philae team must feel at having their baby phone home. Congratulations! Woohooo!! This is so awesome!
deepnet 11y ago
With any luck we will have livestream of a comet entering Perihelion from the surface. This is potentially the space mission of the Century. More surface data is going to change what we know about Solar System formation. Looks like Philae awoke earlier and has accumulated 8000 data packets for transmission to Earth, via Rosetta - fingers crossed for more surface photos later today :D Coupled with Matt Taylor's seat of the pants trajectories through the tail and coma, solar panels buffeted by highly turbulent solar wind - this is going to be a super exciting science adventure. Now we have located Philae, CONSERT'S volumetric map of the comet interior will find out the interior structure and hopefully resolve the contact-binary question. That is if the tidal forces of Jupiter don't tear 67P apart.
- ginko 11y ago
  >This is potentially the space mission of the Century. I would really hope it isn't.
  - deepnet 11y ago
    space mission of the Century , so far...
- Arnt 11y ago
  A livestream from a comet, with a 24W power budget?
  - VLM 11y ago
    Depends on your definition of stream... http://isee3.p3s.nl/philae/ http://isee3.p3s.nl/philae/ So 40 minutes ago the main structure was at +9.17C. Not exactly high def video but still kinda cool. Please don't "hacker news effect" the poor server. But yeah, live streaming data...
    - yellowapple 11y ago
      Either the battery's temperature sensor is malfunctioning, or Philae somehow managed to achieve temperatures far below absolute zero. :)
lordnacho 11y ago
But what's the scientist wearing? :-) Seriously great news, amazing what these guys have managed to achieve. Getting data from a device that's basically run out of power in space is not easy. Ever cut yourself off from a device in a datacentre? This is a fair bit harder.
- douche 11y ago
  goddamn, what a clusterfuck that was... Who cares if the scientist wears a shirt with some titties on it. So much teacup-hurricane outrage.
  - tlear 11y ago
    It is the Exhibit A when I have to discuss SJWs with people
    - lordnacho 11y ago
      What does SJW stand for?
      - yoha 11y ago
        Social Justice Warrior
        rimantas 11y ago
        And sadly, HN is full of them. They don't even feel the irony.
      - rkapsoro 11y ago
        "Social Justice Warrior" http://knowyourmeme.com/memes/social-justice-warrior http://knowyourmeme.com/memes/social-justice-warrior
      - ZeroGravitas 11y ago
        It's the new reactionary right-wing term for "feminazis". They belatedly realised that term made them look ridiculous It'll take them another decade or so to realise that naming your political opponents as warriors for social justice is a boneheaded move.
geoffbrown 11y ago
YESSSSSS!!!!
danso 11y ago
Does anyone have any insight on what the team does while waiting for the lander to wake up? Or in these past months when it wasn't sure if Philae had successfully landed? I know in movies the team would be depicted as hunching over blinking consoles 24/7 and tapping keys furiously until something happened...but how is the team organized to work in the long haul? Are there a few scientists and engineers devoted to the operational status of the lander, while the rest work on examining past data that it has sent? Or they're working on researching the next prototype lander?
- M2Ys4U 11y ago
  Well Rosetta was still operational orbiting the comet and they always hoped that Philae would wake up again, I doubt they would have transferred any significant number of people to other projects.
- nerd_stuff 11y ago
  A couple of things come to mind, though I'm speculating. Operations: Rosetta and Philae are a pair of robots 300 million kilometers from earth, one on a comet and the other orbiting it. Rosetta's orbits require a bit of work, if I remember correctly it's not a stable orbit and Rosetta needs to be within communication range of Philae while Philae is in the sunlight. Science: Interpreting data is not easy and probably takes months in many cases. Once they've come to their conclusions they have to write and publish their papers which takes time. Planning: They have to plan what they will do with Philae's future awake time which is filled with unknowns and opportunities that may only happen once.
neals 11y ago
I really thought the thing was lost when it bounced off a kilomter from the comet. The main-stream news-coverage (for me) ended in dissapointment. So did the lander actually fly back after that bounce and savely land on the surface? Great to hear.
- interdrift 11y ago
  They had confirmed that it had landed a bit rough.
- sanqui 11y ago
  It hasn't flown back, but the comet has moved and is now closer to the Sun, so there is more light for the lander.
- allendoerfer 11y ago
  The bouncing did not mean, that it went off the comet. It just landed very roughly and ended up in a place next to a wall with little exposition to sunlight.
- wbhart 11y ago
  It didn't fly back. It bounced, as in what goes up must (unless it achieves escape velocity), come back down. The comet has gravity, just like earth. Just not much, because it is much smaller than earth
CydeWeys 11y ago
I wish Europe weren't so nuke-averse. The lander should have been powered by a radioisotope thermoelectric generator (RTG), not solar panels. Then it would've had uninterrupted power for years and it could have been returning scientific data continuously since November. Most of the US's long distance space probes have been powered with RTGs, which don't put nearly the same kinds of limitations on mission profiles. The New Horizons mission to Pluto, for example, is powered with 10.9 kg of plutonium that provides a steady 228 watts and enough heat to prevent the kind of cold-related damage we fear happened on Philae. That mission is so far from the Sun that it wouldn't even be possible with only solar panels.
- johansch 11y ago
  The so-called "green parties" have caused a lot of environmental damage to Europe and the earth. Instead of relatively speaking quite safe nuclear power, in many places we are getting quite dangerous coal power. Pretty much just out of ignorance.
  - rimantas 11y ago
    I think nuclear power is safest even in absolute terms not only relatively.
    - dekhn 11y ago
      solar would seem to be safer, presuming you can manufacture the cells without causing environmental degradation.
      - gjm11 11y ago
        Nope, at least not according to the figures I've seen (e.g., http://www.forbes.com/sites/jamesconca/2012/06/10/energys-deathprint-a-price-always-paid/2/ http://www.forbes.com/sites/jamesconca/2012/06/10/energys-de...). I think the main reason is that installing solar panels isn't perfectly safe. Nuclear comes out a long way ahead of solar -- but both are vastly ahead of coal.
bane 11y ago
It's awesome to wake up into a day knowing that humanity is taking another step forward into the boundaries of knowledge. Absolutely awesome.
sidcool 11y ago
Was this intentional hibernation?
- kuschku 11y ago
  Yes and no. The original plan intended that Philae would have power due to being in the sun, but the lander bounced off of the comet and landed in a different place then expected, in the shadow of rough terrain. Due to this the original set of experiments had to be completely run on battery, although the battery capacity was not intended for this. So ESA had to hibernate it early, hoping one day it would get enough sunlight to be able to operate again, and allowing them to do more experiments – which happened now.
  - sidcool 11y ago
    Wow, that's amazing. Hope the lander didn't sustain any damage.
SCAQTony 11y ago
The first photo looks like a submerged, antique, sculpture of a man looking up towards the surface. Just beautiful!
140am 11y ago
Great news. The linked BBC video "What is 67P? In 60 seconds" was very informative as I had little knowledge about 67P :) http://emp.bbc.co.uk/emp/embed/smpEmbed.html?playlist=http%3A%2F%2Fplaylists.bbc.co.uk%2Fnews%2Fscience-environment-29996475A%2Fplaylist.sxml&title=Comet%2067P%20explained%20in%2060%20seconds&product=news&lang=en-gb http://emp.bbc.co.uk/emp/embed/smpEmbed.html?playlist=http%3...
- pimlottc 11y ago
  Nice music, too ;)
stbullard 11y ago
Wow! And XKCD has already updated his epic Landing live-comic: https://xkcd.com/1446/ https://xkcd.com/1446/ (See http://www.explainxkcd.com/wiki/index.php/1446:_Landing http://www.explainxkcd.com/wiki/index.php/1446:_Landing for the background)
- bitwize 11y ago
  I'm on a comet! I'm on a comet! Take a good hard look at the motherf*ing comet!
warmcat 11y ago
Wow....I just read "The Martian" novel and this reminds me of a scene when the astronaut uses the dead Pathfinder probe to communicate with Earth.
- LAMike 11y ago
  Awesome book!
saidajigumi 11y ago
The long-running XKCD comic "Landing" has been updated for the occasion: http://xkcd.com/1446/ http://xkcd.com/1446/
return0 11y ago
"In any case, by March 2015, when the comet is closer to the Sun, it is likely that the lander will become too hot to operate. [...] It will next pass through perihelion on 13 August 2015, 186 million kilometres from the Sun." (http://www.esa.int/Our_Activities/Space_Science/Rosetta/Frequently_asked_questions http://www.esa.int/Our_Activities/Space_Science/Rosetta/Freq...) Will the heat affect the lander's measurements?
aaronharnly 11y ago
The NYTimes is running a nice collection[1] of the jaw-dropping photos of the comet from Rosetta over the course of the mission, including some from the past month, and the spectacular close fly-by in March. As many faraway and strange places as we've explored in the Solar System so far, something about this comet – roughly the breadth of Central Park, yet with untold nooks and crannies – feels more coldly alien than anything else I've seen. [1] http://www.nytimes.com/interactive/2015/03/20/science/space/rosetta-comet-photos.html http://www.nytimes.com/interactive/2015/03/20/science/space/...
- jxcl 11y ago
  These are fantastic. I want to get them printed and hang them up on my wall.

922 points by DangerousPie 11y ago

orf 11y ago

When I'm feeling particularly melancholy I tell myself that none of the apps I've made are ever going to outlive me, and they really don't matter in the scheme of things. But this... this is cool. Someone somewhere has programmed that lander so that it's able to not only able to locate earth (whilst hurtling through god knows where on a big rock) but also successfully re-establish communications. Those developers must be having a good day today, finally seeing their work come to fruition.

deleted 11y ago
[deleted]
pja 11y ago
I believe the lander is communicating via the Rosetta probe which is relaying its data to earth. (This design meant that Philea needs to dedicate very little power to radio transmissions.) It’s still awesome though :)

kartikkumar 11y ago

Wowoweeeee! This is FANTASTIC news! One of the few times that I have felt like typing in all caps. Incredible news and a testament to the survivability of space hardware. It'll be interesting to see how quickly they can triangulate Philae's true position to better understand the amount of incident light reaching the solar panels. It'll also be interesting to see how much of the payload has survived. Any more data would be of huge scientific value! Definitely made my day! :) EDIT: fixed typo

aaggarwal 11y ago
Yes, amazing news, I am waiting for more data to come in to analyze the comet surface and the condition of the lander. This is obviously one the biggest achievement of modern space missions and ESA.
- kartikkumar 11y ago
  Here's a little bit more info on the nature of the signal received: http://blogs.esa.int/rosetta/2015/06/14/rosettas-lander-philae-wakes-up-from-hibernation/ http://blogs.esa.int/rosetta/2015/06/14/rosettas-lander-phil... 24W is pretty good. More data on the instrumentation onboard can be found in DLR's fact sheet [1]. So I'm guessing if the hardware has survived, we should see some more science data trickling in. Fingers crossed! [1] http://www.dlr.de/dlr/Portaldata/1/Resources/documents/Philae_Lander_FactSheets.pdf http://www.dlr.de/dlr/Portaldata/1/Resources/documents/Phila...
  - aaggarwal 11y ago
    Yes, the power is pretty good. The temperature is currently told as -35 degree Celsius. I wonder how fast would the temperature variations be, with respect to the movement of the comet and how the lander with adjust to that.
    - INTPenis 11y ago
      That temperature made me think that humans could survive there if only they were sheltered from the vacuum and radiation of space. I expected the temperature to be much lower, could this temperature be on the sunny side?
      - aaggarwal 11y ago
        I am also surprised. I guess its because the comet is near perihelion.
- aidanhs 11y ago
  Also an impressive achievement on the software side of things - no room for showstopper bugs here! It's not quite as simple as taking it offline, deploying some new code and starting it up again. Is there any information on the processes used to have such a high level of confidence in the software? Lots of simulation? Relatedly, it might also be interesting to see a list of 'known bugs' and ways they've been worked around.

JohnHammersley 11y ago

Woo hoo! What amazing news, especially given the difficulties during the landing. For those who didn't see the original coverage, you can see some brilliant photos of the bounce the lander made during it's landing on the comet here: http://www.space.com/27788-philae-comet-landing-bounce-photos.html http://www.space.com/27788-philae-comet-landing-bounce-photo... Also a hat tip to the earlier missions (such as the Beagle probe that was lost on Mars) which emphasized the importance of retaining radio contact for as long as possible during landing and being able to send and receive commands with the minimum amount of hardware reconfiguration once landed. What a fantastic start to Sunday!

benihana 11y ago

Oh my goodness I cannot image the excitement the Philae team must feel at having their baby phone home. Congratulations! Woohooo!! This is so awesome!

deepnet 11y ago

With any luck we will have livestream of a comet entering Perihelion from the surface. This is potentially the space mission of the Century. More surface data is going to change what we know about Solar System formation. Looks like Philae awoke earlier and has accumulated 8000 data packets for transmission to Earth, via Rosetta - fingers crossed for more surface photos later today :D Coupled with Matt Taylor's seat of the pants trajectories through the tail and coma, solar panels buffeted by highly turbulent solar wind - this is going to be a super exciting science adventure. Now we have located Philae, CONSERT'S volumetric map of the comet interior will find out the interior structure and hopefully resolve the contact-binary question. That is if the tidal forces of Jupiter don't tear 67P apart.

ginko 11y ago
>This is potentially the space mission of the Century. I would really hope it isn't.
- deepnet 11y ago
  space mission of the Century , so far...
Arnt 11y ago
A livestream from a comet, with a 24W power budget?
- VLM 11y ago
  Depends on your definition of stream... http://isee3.p3s.nl/philae/ http://isee3.p3s.nl/philae/ So 40 minutes ago the main structure was at +9.17C. Not exactly high def video but still kinda cool. Please don't "hacker news effect" the poor server. But yeah, live streaming data...
  - yellowapple 11y ago
    Either the battery's temperature sensor is malfunctioning, or Philae somehow managed to achieve temperatures far below absolute zero. :)

lordnacho 11y ago

But what's the scientist wearing? :-) Seriously great news, amazing what these guys have managed to achieve. Getting data from a device that's basically run out of power in space is not easy. Ever cut yourself off from a device in a datacentre? This is a fair bit harder.

douche 11y ago
goddamn, what a clusterfuck that was... Who cares if the scientist wears a shirt with some titties on it. So much teacup-hurricane outrage.
- tlear 11y ago
  It is the Exhibit A when I have to discuss SJWs with people
  - lordnacho 11y ago
    What does SJW stand for?
    - yoha 11y ago
      Social Justice Warrior
      - rimantas 11y ago
        And sadly, HN is full of them. They don't even feel the irony.
    - rkapsoro 11y ago
      "Social Justice Warrior" http://knowyourmeme.com/memes/social-justice-warrior http://knowyourmeme.com/memes/social-justice-warrior
    - ZeroGravitas 11y ago
      It's the new reactionary right-wing term for "feminazis". They belatedly realised that term made them look ridiculous It'll take them another decade or so to realise that naming your political opponents as warriors for social justice is a boneheaded move.

geoffbrown 11y ago

YESSSSSS!!!!

danso 11y ago

Does anyone have any insight on what the team does while waiting for the lander to wake up? Or in these past months when it wasn't sure if Philae had successfully landed? I know in movies the team would be depicted as hunching over blinking consoles 24/7 and tapping keys furiously until something happened...but how is the team organized to work in the long haul? Are there a few scientists and engineers devoted to the operational status of the lander, while the rest work on examining past data that it has sent? Or they're working on researching the next prototype lander?

M2Ys4U 11y ago
Well Rosetta was still operational orbiting the comet and they always hoped that Philae would wake up again, I doubt they would have transferred any significant number of people to other projects.
nerd_stuff 11y ago
A couple of things come to mind, though I'm speculating. Operations: Rosetta and Philae are a pair of robots 300 million kilometers from earth, one on a comet and the other orbiting it. Rosetta's orbits require a bit of work, if I remember correctly it's not a stable orbit and Rosetta needs to be within communication range of Philae while Philae is in the sunlight. Science: Interpreting data is not easy and probably takes months in many cases. Once they've come to their conclusions they have to write and publish their papers which takes time. Planning: They have to plan what they will do with Philae's future awake time which is filled with unknowns and opportunities that may only happen once.

neals 11y ago

I really thought the thing was lost when it bounced off a kilomter from the comet. The main-stream news-coverage (for me) ended in dissapointment. So did the lander actually fly back after that bounce and savely land on the surface? Great to hear.

interdrift 11y ago
They had confirmed that it had landed a bit rough.
sanqui 11y ago
It hasn't flown back, but the comet has moved and is now closer to the Sun, so there is more light for the lander.
allendoerfer 11y ago
The bouncing did not mean, that it went off the comet. It just landed very roughly and ended up in a place next to a wall with little exposition to sunlight.
wbhart 11y ago
It didn't fly back. It bounced, as in what goes up must (unless it achieves escape velocity), come back down. The comet has gravity, just like earth. Just not much, because it is much smaller than earth

CydeWeys 11y ago

I wish Europe weren't so nuke-averse. The lander should have been powered by a radioisotope thermoelectric generator (RTG), not solar panels. Then it would've had uninterrupted power for years and it could have been returning scientific data continuously since November. Most of the US's long distance space probes have been powered with RTGs, which don't put nearly the same kinds of limitations on mission profiles. The New Horizons mission to Pluto, for example, is powered with 10.9 kg of plutonium that provides a steady 228 watts and enough heat to prevent the kind of cold-related damage we fear happened on Philae. That mission is so far from the Sun that it wouldn't even be possible with only solar panels.

johansch 11y ago
The so-called "green parties" have caused a lot of environmental damage to Europe and the earth. Instead of relatively speaking quite safe nuclear power, in many places we are getting quite dangerous coal power. Pretty much just out of ignorance.
- rimantas 11y ago
  I think nuclear power is safest even in absolute terms not only relatively.
  - dekhn 11y ago
    solar would seem to be safer, presuming you can manufacture the cells without causing environmental degradation.
    - gjm11 11y ago
      Nope, at least not according to the figures I've seen (e.g., http://www.forbes.com/sites/jamesconca/2012/06/10/energys-deathprint-a-price-always-paid/2/ http://www.forbes.com/sites/jamesconca/2012/06/10/energys-de...). I think the main reason is that installing solar panels isn't perfectly safe. Nuclear comes out a long way ahead of solar -- but both are vastly ahead of coal.

bane 11y ago

It's awesome to wake up into a day knowing that humanity is taking another step forward into the boundaries of knowledge. Absolutely awesome.

sidcool 11y ago

Was this intentional hibernation?

kuschku 11y ago
Yes and no. The original plan intended that Philae would have power due to being in the sun, but the lander bounced off of the comet and landed in a different place then expected, in the shadow of rough terrain. Due to this the original set of experiments had to be completely run on battery, although the battery capacity was not intended for this. So ESA had to hibernate it early, hoping one day it would get enough sunlight to be able to operate again, and allowing them to do more experiments – which happened now.
- sidcool 11y ago
  Wow, that's amazing. Hope the lander didn't sustain any damage.

SCAQTony 11y ago

The first photo looks like a submerged, antique, sculpture of a man looking up towards the surface. Just beautiful!

140am 11y ago

Great news. The linked BBC video "What is 67P? In 60 seconds" was very informative as I had little knowledge about 67P :) http://emp.bbc.co.uk/emp/embed/smpEmbed.html?playlist=http%3A%2F%2Fplaylists.bbc.co.uk%2Fnews%2Fscience-environment-29996475A%2Fplaylist.sxml&title=Comet%2067P%20explained%20in%2060%20seconds&product=news&lang=en-gb http://emp.bbc.co.uk/emp/embed/smpEmbed.html?playlist=http%3...

pimlottc 11y ago
Nice music, too ;)

stbullard 11y ago

Wow! And XKCD has already updated his epic Landing live-comic: https://xkcd.com/1446/ https://xkcd.com/1446/ (See http://www.explainxkcd.com/wiki/index.php/1446:_Landing http://www.explainxkcd.com/wiki/index.php/1446:_Landing for the background)

bitwize 11y ago
I'm on a comet! I'm on a comet! Take a good hard look at the motherf*ing comet!

warmcat 11y ago

Wow....I just read "The Martian" novel and this reminds me of a scene when the astronaut uses the dead Pathfinder probe to communicate with Earth.

LAMike 11y ago
Awesome book!

saidajigumi 11y ago

The long-running XKCD comic "Landing" has been updated for the occasion: http://xkcd.com/1446/ http://xkcd.com/1446/

return0 11y ago

"In any case, by March 2015, when the comet is closer to the Sun, it is likely that the lander will become too hot to operate. [...] It will next pass through perihelion on 13 August 2015, 186 million kilometres from the Sun." (http://www.esa.int/Our_Activities/Space_Science/Rosetta/Frequently_asked_questions http://www.esa.int/Our_Activities/Space_Science/Rosetta/Freq...) Will the heat affect the lander's measurements?

aaronharnly 11y ago

The NYTimes is running a nice collection[1] of the jaw-dropping photos of the comet from Rosetta over the course of the mission, including some from the past month, and the spectacular close fly-by in March. As many faraway and strange places as we've explored in the Solar System so far, something about this comet – roughly the breadth of Central Park, yet with untold nooks and crannies – feels more coldly alien than anything else I've seen. [1] http://www.nytimes.com/interactive/2015/03/20/science/space/rosetta-comet-photos.html http://www.nytimes.com/interactive/2015/03/20/science/space/...

jxcl 11y ago
These are fantastic. I want to get them printed and hang them up on my wall.