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revised How can we tell if the asteroid 2013 TV135 will hit Earth in 2032?
typo fixed
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?