Recent comments in /f/space

extra_specticles t1_jdz5lm3 wrote

Well the ISS is only about 400km from earth, so what they see is pretty much the same, only not obscured by clouds and light pollution. 400km is only the distance from London to just past Paris. So they are not going to see much more than we do.

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motogucci t1_jdz0pb9 wrote

Innermost exoplanet around a star referred to as TRAPPIST-1. It's not so nearby as to be in our solar system.

There are 7 known exoplanets around this star, which is a little over 40 light years away. TRAPPIST-1 appears to be named after the telescope that initially discovered it in 1999. It would appear in the sky adjacent to the Aquarius constellation, on the side near Pisces.

But it is an ultra-cool red dwarf. Not quite 9% the sun's mass, and slightly larger in volume than Jupiter. (On the order of 100 times the mass of Jupiter.) You're unlikely to see it with the naked eye.

The suspicion due to understandings of such a star, is that the planets would all be tidally locked, and any atmospheres would have been blown away by their star early on. Using the assumption of tidal lock, the known orbital distance, and some imaging technique newly possible with the James Webb telescope, they have probably confirmed that there is no atmosphere. But supposedly there is a margin of error due to the limits of the imaging, that it could possibly have atmosphere up to 0.1 times as dense as Earth's.

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jaibhavaya t1_jdz01j3 wrote

I guess that makes sense… if matter wasn’t already coalescing, then what would have collapsed to create the initial black hole? The black hole forms an accretion disk, then the accretion disk pulls other matter into orbit… and suddenly you have a galaxy? So really the “rest” of the galaxy ends up orbiting around its collective center of gravity, that just so happens to be close to the center of this initial big ol’ black hole.

Or something like that? I read that on the underside of a Snapple cap.

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No-Pirate-4752 t1_jdyvqvw wrote

I believe one must match the rate of acceleration and trajectory in order to collect ONE piece of space junk. The energy needs for this are IMMENSE. However, there is indeed a need to collect space junk and get itbout of orbit. For the safety of both government and commercial space flights.

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