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Oct
10
comment Is there a theoretical limit on telescope's resolution?
@anixx: no idea. My main guess is: political decision (also during the design phase). Then founding institutions that use the VLT are probably mostly interested in extremely faint objects (with the exclusion of rocks :D)
Oct
10
answered Is there a theoretical limit on telescope's resolution?
Oct
5
awarded  Enlightened
Oct
5
awarded  Nice Answer
Sep
25
awarded  Yearling
Jul
21
comment Does near light-speed travel doppler-shift the light from the target into gamma rays?
I think that going that fast you should be more worried about the atoms of hydrogen or helium and the grains of dust that you meet than about gamma rays.
Mar
4
reviewed No Action Needed What will happen to life on Earth when Andromeda and Milky Way galaxies collide?
Mar
4
reviewed Close Age of the universe
Mar
4
reviewed Close Black Hole, Object or Portal?
Jan
3
reviewed No Action Needed What Is The Great Attractor?
Jan
2
reviewed Leave Closed What skills would a software developer need to get a job in space research or exploration organization?
Jan
2
reviewed Leave Closed Which planet or moon has all resources that can be used to sustain life in a controlled biosphere?
Dec
20
comment What was the length of year 1 million years back?
@Envite: I don't think that I have an answer. Besides Walter already expanded my comments
Dec
20
comment When is optical refraction important in astronomy?
@astromax: thanks for editing my posts :D
Dec
19
reviewed No Action Needed How does the Milky Way look like above 66° North and below 66° South?
Dec
19
revised When is optical refraction important in astronomy?
add generalisation to my example
Dec
19
comment When is optical refraction important in astronomy?
@AlexeyBobrick. I know that Gravitational lensing is not refraction (that's why I wrote if you allow me), but it's the biggest effect that looks like refraction. I'm searching for some info about interstellar/intergalactic medium refraction, so I'll likely update my answer soon. About "I think that refraction has little/no impact in astronomy": the main reason is that I don't remember any talk/paper/discussion about refraction. And if it were a problem, would be important for cosmology (my field).
Dec
19
comment What can be seen with a 4.5" telescope
Once I've seen Andromeda with a similar telescope: it looks like a cloud as (I think) the telescope is too small to see any structure. The sky was relatively dark.
Dec
18
answered When is optical refraction important in astronomy?
Dec
18
comment What was the length of year 1 million years back?
@AlexanderJanssen: it's complicated for a comment. I wouldn't say the expansion exerts a force. It's more like dragging whatever is in the universe. But when gravitation attraction between two masses becomes strong enough, they begin to disentangle from the expansion and when they reach equilibrium their reciprocal motion becomes (mostly) independent from what happens outside the system (although some parameters of their status might be influenced by the expansion status when they decoupled)