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seen Apr 10 at 7:59

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Mar
23
comment What limits the usable focal length of telescopes currently?
I wonder, radio waves, optical waves, that's all electromagnetic radiation, just different wavelengths. What's with optical waves that prevents radio waves tech to be adapted to that spectrum?
Mar
19
accepted What limits the usable focal length of telescopes currently?
Mar
11
accepted When did the Moon stop?
Mar
10
comment Why are most lunar maria on the visible side?
while Earth itself may obscure 4 degrees of Lunar sky, its gravitational field covers substantially more.
Mar
10
accepted Why are most lunar maria on the visible side?
Feb
28
comment When did the Moon stop?
"Earth may have accelerated impactors by gravity assist." - Yes, like the one that created Tycho. Fewer - but stronger.
Feb
28
comment Do meteorites streak across the sky in the same direction?
If the point they "come from" happens to be near the horizon, it may appear as if they are all going in one direction - from direction of that point (as all the others simply vanish below the horizon before you could see them).
Feb
27
revised Why is the interstellar medium so hot?
added 62 characters in body
Feb
27
asked When did the Moon stop?
Feb
26
asked Why are most lunar maria on the visible side?
Jan
10
accepted apparent size of an astronomical body
Jan
10
asked apparent size of an astronomical body
Jan
10
accepted Affordable night sky photography
Jan
9
awarded  Nice Question
Jan
5
awarded  Nice Question
Nov
27
awarded  Nice Question
Nov
21
comment Why is the interstellar medium so hot?
@AlexeyBobrick: Sorry, I don't.
Nov
20
answered Why is the interstellar medium so hot?
Nov
20
comment Appearance (popularity) ranking of stars?
Thank you, that's a very nice answer covering a large part of the field, but it still only scratches the surface of the problem of popularity of types of stars/bodies of similar mass, so I'm going to leave this question open.
Nov
15
asked Appearance (popularity) ranking of stars?