dtparr

16 ms·

121.
by dtparr 9y ago
You're agreeing with his point. The plan was not to orbit Mars. However, your language sounds like they were going to circularize at 'about the distance of mars', which they were not (that too would have required a burn mont
122.
by dtparr 9y ago
Interesting. Looks like a 1-3-1 burn (start with 1, ignite two more for a bit, then finish on a single one). I wonder how much longer the '3 engine burn' was for the GovSat launch last week that did a 'water landing'
123.
by dtparr 9y ago
Yes, and yes. The less time you're in the air, the less fuel needed to counter gravity's continual pull, so the most efficient landing burn is basically the highest acceleration you can handle without coming apart such that your
124.
by dtparr 9y ago
I believe that was in reference to the Falcon Heavy, not the F9. The F9 is expected to be man-rated for NASA's commercial crew program.
125.
by dtparr 9y ago
The latest hardware revision that's expected to be the mainstay for F9 flights going forward. Has better performance and addresses some reusability issues discovered in earlier blocks.
126.
by dtparr 9y ago
So, sure, I get people don't like it, but I don't think that's due to the fact that it can't serve effectively as an ice breaker. If this was another story about engines breaking down or something like that, sure, but a
127.
by dtparr 9y ago
Yeah, I'm not sure why this is big news. The headline reads to me like "Man buys McLaren P1 for $1M. Doesn't take it out of garage after winter storm covers roads in sheets of ice".
128.
by dtparr 9y ago
Puppies generally start walking about 3wks in, while babies are usually at least 6 months before crawling. So that closes the timeline somewhat, but there's still a large gap.
129.
by dtparr 9y ago
Or "Steve Jobs Hoverbikes" http://theoatmeal.com/comics/tesla_model_s2
130.
by dtparr 9y ago
If it can read the right data (private keys, etc.), then it can write whatever it wants.
131.
by dtparr 9y ago
That's the plan. The center core at sea on the ASDS, both side boosters back at the Cape.
132.
by dtparr 9y ago
Bless their heart.
133.
by dtparr 9y ago
skgoa said "The stock price has dropped by $64 since the start of the week BTW." It has dropped ~$25 since the start of the week. It's down $64 from its all-time high.
134.
by dtparr 9y ago
That's not correct. $389 is its all-time high. It closed at ~$345 on Friday and opened ~$350 on Monday.
135.
by dtparr 9y ago
I tried to, but the original title "Association of Blood Transfusion From Female Donors With and Without a History of Pregnancy With Mortality Among Male and Female Transfusion Recipients" was approximately double the maximum leng
136.
Blood Transfusion from Ever-Pregnant Females Associated with Mortality in Males(jamanetwork.com)
62 points by dtparr 9y ago|48 comments
137.
by dtparr 9y ago
FYI, Kepler's 3rd law (the square of the orbital period of a planet is directly proportional to the cube of the semi-major axis of its orbit) means it'll orbit very slowly (a planet just 100 au out would have nearly a 1000 Earth-y
138.
by dtparr 9y ago
Good points. I've always taken the spirit of that saying to be more like "thick enough to have to deal with, too thin to be enough". On the moon, you don't have to worry about reentry at all, so no need for a heat shiel
139.
by dtparr 9y ago
Like how UPS charges customers who have packages in the truck when they're involved in accidents?
140.
by dtparr 9y ago
Because I like to be skeptical both ways, do you have any way to establish your bona fides as a Cruise employee while still being anonymous? Also, that sounds terrible. What's keeping you (or anyone else) there?
141.
by dtparr 9y ago
Wired's write-up from yesterday has a few more details including some quotes from Delta personnel: https://www.wired.com/story/delta-plane-hurricane-irma
142.
by dtparr 9y ago
It's not exactly your "airspace" at 550km (the reported apogee) as, among other things, there's no air. That's 150km higher than the ISS orbits. It won't be a perfect ballistic curve due to the boost phase no
143.
by dtparr 9y ago
How? Surely there are accidents that would leave little or no evidence after pulling the sub off the bottom. Blunt force trauma to the head or something similar where there was no blood loss, but severe internal injuries.
144.
by dtparr 9y ago
shrug Apparently the peculiarity and the fact that the accused is well known in certain tech/engineering sectors has passed the 'things hackers are interested in' bar. From the same guidelines you quote: Please don&#x2
145.
by dtparr 9y ago
For context/history, here's the discussion from last week when the events were first reported (and his story was that he'd dropped her off at shore, still alive): https://news.ycombinator.com/item?id=14998270
146.
by dtparr 9y ago
Regarding the interpretation of > It's chemical rockets, nukes or a space elevator. At least given known physics. He's giving a series of 3 things that he's asserting are viable given known physics, so the second two are a
147.
by dtparr 9y ago
In fact it does do something for polar launches, but it's bad. Being close to the equator means cancelling out more rotational velocity to go into a polar orbit.
148.
SpaceX goes there–seeks government funds for deep space(arstechnica.com)
1 points by dtparr 9y ago|0 comments
149.
by dtparr 9y ago
From https://en.wikipedia.org/wiki/Pumped-storage_hydroelectricit... > The round-trip energy efficiency of PSH varies between 70%–80%,[4][5][6][7] with some sources claiming up to 87%.[8]
150.
by dtparr 9y ago
Your wording makes it sound like there have been two launches with the new grid fins. For clarification, I believe you meant the second of this weekend's launches was the first to use the new grid fins.

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