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Dec
9
comment Can Doppler shift make colors of two stars at same distance different?
@kasperd I don't mean it in the sense "cannot be observed". I rather mean it in the sense that the probability of existence of such a system to the resolution limits our instruments support is very low. Sorry for the confusion.
Nov
8
awarded  Nice Question
Sep
24
awarded  Yearling
Dec
19
reviewed Approve If the moon wasn't receding from Earth, what would be the impact on the weather and tides?
Dec
19
reviewed Approve Does the Earth have another moon?
Nov
25
answered Astronomy Olympiad Books
Nov
6
comment At what density does helium burning start in a star?
Order of $10^4$ g/cc I will elaborate when I get to my desktop
Oct
10
comment How many stars can stay close to each other without collapsing?
@caters Post your report link here. I want to see it.
Sep
24
awarded  Yearling
Sep
24
awarded  Autobiographer
Sep
11
reviewed Approve If the speed at which the universe contracts in reverse time decreases over time, then how did scientists arrive at a date for “The Big Bang”?
Sep
7
reviewed Approve What can a lunar-based telescope do?
Sep
2
reviewed Approve How to identify stars in photographs?
Sep
1
reviewed Approve Thought experiment about the outskirts of the universe
Aug
25
reviewed Approve What's an order-of-magnitude main sequence star look like?
Aug
25
reviewed Approve How do black holes evaporate?
Aug
20
reviewed Approve Why don't planets give off their own light?
Aug
8
reviewed Approve What would the effects be on Earth if Jupiter was turned into a star?
Aug
6
awarded  Quorum
Aug
5
reviewed Approve Determining planetary positions on the celestial sphere by Right Ascension and Declination