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Direct Imaging and Spectroscopy of an Exoplanet with a Solar Gravity Lens
- pizza 9y agoRelated projects [0] Imaging With Nature: Planet Sized Sensors (July 24th, 2010) Imaging With Nature: A Cloud Based Sun Imager (July 25th, 2010) A Galaxy Wide Single Pixel Camera (November 6th, 2010) [0] https://sites.google.com/site/igorcarron/thesetechdonotexist https://sites.google.com/site/igorcarron/thesetechdonotexist
- Scaevolus 9y agoUsing the sun as a gravitational lens is our current best option for interstellar communications, presuming we settled a planet within a hundred light years: https://www.centauri-dreams.org/2009/11/06/the-gravitational-lens-and-communications/ https://www.centauri-dreams.org/2009/11/06/the-gravitational...
- nategri 9y agoThis is insanely cool. I had no idea this was possible. If I'm reading right the spacecraft would have to be placed at about 600-850 AU from the sun to take advantage of the solar gravity lens. For reference, Pluto's orbit is located at (roughly) 40 AU.
- nerfhammer 9y agocould we use New Horizons to do it? ...I suppose not, it's taken 10 years for it to go 40AU so for it to go to 400AU it would take 100 years...
- everdev 9y agoBut only ~65 hours to send the data back, not bad.
- simonh 9y agoYou'd need a specialised imaging sensor and optics assembly. New Horizons is optimized for relatively close range planetary survey work. Also it's communications array isn't anywhere near up to maintaining the link back home from that far.
- rbanffy 9y agoYou'd probably need to pack a multi-mode propulsion system. Launch it so it can get a gravity assist from the Sun, deploy a solar sail after closest approach (or when safe) and ride the light pressure from the Sun to get as much delta-v as you can, then ditch the sail and fire up nuclear-powered electric thrusters for the rest of the trip. Dropping the solar sail part may be a good idea if its weight could be better used as propellant for the ion drive. Then you have a hope of making the trip in a couple decades
- londons_explore 9y agoPresumably when you get to the right distance, you'd want to circularise your orbit so you can use your new solar lens to look in many different directions. Even more dV and time required to do that...
- rbanffy 9y agoYes... There will be a lot of braking involved, but we may start doing observations well before it reaches the intended circular orbit. I wonder how much such a mission would cost.
- coldnose 9y agoThis sounds like moonshot-level complexity. It invokes solar sails, laser communication at 550 AU, as well as "advanced propulsion, lightweight telescopes, membrane mirrors, inflatable/rigidizeable structures, and novel coronagraphic techniques." All that for a telescope you can't aim...
- IntronExon 9y agoMoonshot x Manhattan Project with a dash of Star Trek. Basically we need the next few generations of novel materials, and controlled fusion reactions. Assuming no major setbacks for humans, we’d need more than a century before considering this kind of project. It would be a worthy project, although I wonder if some other tech might not supersede it by the time this was ready? Gravitational astronomy is just getting started after all, and who knows, maybe the dream of neutrino astronomy could happen.
- skew 9y agoInteresting that you mention neutrino astronomy - if you mean imaging, I don't know of anything but gravity that could focus neutrinos.
- mturmon 9y agoThis is the workshop where some of these ideas were discussed: http://kiss.caltech.edu/workshops/ism/ism.html http://kiss.caltech.edu/workshops/ism/ism.html There appear to be several groups working on related designs for gravity-based imagers. One of the three organizers of the workshop is Ed Stone, who is the Voyager PI.
- sanxiyn 9y agoFor a more critical look at this concept, I recommend "Mission to the Gravitational Focus of the Sun: A Critical Analysis". https://arxiv.org/abs/1604.06351 https://arxiv.org/abs/1604.06351
- cromwellian 9y agoNASA's WFIRST mission is trying to do gravitional microlensing observations, but Trump's latest budget kills it. https://en.wikipedia.org/wiki/Wide_Field_Infrared_Survey_Telescope https://en.wikipedia.org/wiki/Wide_Field_Infrared_Survey_Tel...
- sanxiyn 9y agoNote that gravitational microlensing is a completely different technique from solar gravitational lensing discussed in the linked paper.
- curtis 9y agoI've wondered for a while if this could be done. I guess now I know. The potential for exploiting the Sun as a gravitation lens comes up on Centauri Dreams from from time to time (see https://www.google.com/search?q=%22gravitational+lens%22+site%3Acentauri-dreams.org https://www.google.com/search?q=%22gravitational+lens%22+sit...).
- loxias 9y agoIs there anyone who's sufficiently qualified in astronomy/astrophysics who could point out what advances in HPC/modelling/signal processing will be necessary to accelerate things like this? I don't know telescopes but I know enough about DSP to make me suspect this is gonna need all sorts of fun high performance deconvolution algorithms....
- jagger27 9y agoWhile forming a complete image is no doubt very cool, just a few fragments of light spectrum would give us incredible insight on its own. I'm wondering now if with BFR we could pre-place fuel in the slingshot path to get it there quicker and depend less on the Sun gravity slingshot.