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seen Dec 9 '13 at 6:32

Jan
31
awarded  Popular Question
Oct
4
accepted How do astronomers measure the distance of the planets from its star?
Oct
3
awarded  Supporter
Oct
2
comment How do astronomers measure the distance of the planets from its star?
How's the planet's mass has something to do with measuring its distance from its star? Also, how does that stack up against interferometry as described in this link? (en.wikipedia.org/wiki/Astrometry#Applications)
Oct
2
awarded  Student
Oct
2
comment How do astronomers measure the distance of the planets from its star?
Yes, possibly triangulation. But what I actually meant to ask is, do they really have the tools to accurately use triangulation as far as 22 light years? I mean, we can surely measure the distance of something using a ruler but if you're going to use it for long distances, the magnitude of error will surely increase (of course I'm just oversimplifying here but you get the idea). And for a distance of 22 light years I'm skeptical about its accuracy to be any meaningful at all.
Oct
2
asked How do astronomers measure the distance of the planets from its star?
Jul
22
comment Which universe had a beginning? The universe or the observable universe?
Why not? Even Wikipedia makes distinction between the two. It says QUOTE ... the observable universe is a spherical volume centered on the observer, regardless of the shape of the universe as a whole. Every location in the universe has its own observable universe which may or may not overlap with the one centered on the Earth. UNQUOTE en.wikipedia.org/wiki/Observable_universe
Jul
22
comment Which universe had a beginning? The universe or the observable universe?
To my understanding, the observable universe is simply a subset of the entire universe. I'm just confused how sometimes people use those terms interchangeably. And I just wanted to know what universe the theory is trying to refer to when it says the universe had a beginning.
Jul
22
comment Which universe had a beginning? The universe or the observable universe?
So does this also mean that entire universe is not the same as the observable universe? Or does it depend on the theory too?
Jul
22
awarded  Scholar
Jul
22
accepted Which universe had a beginning? The universe or the observable universe?
Jul
21
asked Which universe had a beginning? The universe or the observable universe?