819 reputation
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bio website dotancohen.com
location
age 37
visits member for 1 year, 2 months
seen 12 hours ago

Nov
24
revised moonless night and lunar phase
Proper capitalisation
Nov
24
answered moonless night and lunar phase
Nov
23
answered Why does a particle feel no force at radii greater than itself?
Nov
23
comment What should I look for in an astronomy tripod?
I need to take that picture for you!
Nov
9
answered What should I look for in an astronomy tripod?
Nov
3
comment I'd like to become an astronomer. What experience do I need?
I think that closing the question rather than asking for clarification is plain wrong. You could simply point the OP to Swinburne Astronomy Online or even Galaxy Zoo and answer their question. In fact, almost every single "star tour" that I give people ask "How can I become an astronomer". The field is so broad, and there is so much work for amateurs to do, that you are doing the OP and the community a disservice by closing this common, valid question.
Nov
3
comment How would Special relativity explain past-present-future if thinking about 13-billion-light-years distanced objects
Considering your example of the gravitational lensing, I'm removing my former comment. When I get some time I'll research the issue and get back to you. It won't be this week, though! Thank you.
Nov
3
awarded  Enlightened
Nov
3
awarded  Nice Answer
Nov
2
answered time on earth compared to completely stationary in space
Oct
19
comment Might Oort cloud comets be exchanged between solar systems?
Thank you for this terrific analysis.
Oct
19
comment Do all stars have an oort cloud or is it a rare occurance?
Concerning the assertion that passing stars may disturb Oort cloud objects, this question is in need of elucidation!
Oct
19
comment Might Oort cloud comets be exchanged between solar systems?
Note that this answer supports the assertion that passing stars can influence Oort cloud objects.
Oct
16
comment Time period in which a planet rotates
@DavidHammen: Thank you. What would be the case for objects whose vernal equinox precesses at an exaggerated pace?
Oct
14
revised Time period in which a planet rotates
Correct link
Oct
14
accepted Time period in which a planet rotates
Oct
14
comment Time period in which a planet rotates
Thank you Stan. I've been castrated more than once on English.SE for suggesting that a word's meaning could be inferred by its etymology. Apparently some people think that that term "living language" means "words mean whatever I want them to mean".
Oct
14
asked Time period in which a planet rotates
Oct
13
comment Can we see individual stars in other galaxies?
An event that occurs to a star.
Oct
13
comment Can we see individual stars in other galaxies?
In what way is a SN not a star? You could argue that a SN is a short-lived phase of a star, and I would agree with that. But for purpose of this discussion, in which the asker is interested in seeing spheres of fusing elements in other galaxies, a SN fits the description.