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Mar
17
comment LIGO and Fabry–Pérot interferometer
Can you link some references?
Mar
17
comment Why do dark objects look white from a distance? (Moon, Ceres, but not Earth!)
Can you link such an image where the Earth does NOT shine as seen from the Moon? Just as a clue, why does the Moon is not always as bright as the full Moon?
Mar
8
comment Angular momentum in planetary disk formation
I suppose this is related with the formation of the system itself (the mass has to flow towards the inner region). Could you please link a reference where you read about the angular momentum condition?
Mar
7
comment How was Henrietta Leavitt's discovery important for star measurement?
Please, be more specific and edit your question if some of the links do not answer your (not yet formulated) question.
Mar
5
revised How do astronomers estimate the total mass of dust in clouds and galaxies?
added 413 characters in body
Mar
5
comment How do astronomers estimate the total mass of dust in clouds and galaxies?
@RobJeffries, thanks for pointing this out. What I meant is that, $N_H$ and extinction are related, therefore one helps to infer the other. I will edit my answer.
Mar
5
answered How do astronomers estimate the total mass of dust in clouds and galaxies?
Mar
5
comment How was Henrietta Leavitt's discovery important for star measurement?
Duplicate of and related to: astronomy.stackexchange.com/questions/3685/…; astronomy.stackexchange.com/questions/932/…; astronomy.stackexchange.com/questions/8037/…; astronomy.stackexchange.com/questions/1177/….
Mar
4
reviewed Edit Why are galaxies disk shaped?
Mar
4
revised Why are galaxies disk shaped?
(1) Changed L=mvr2 to L=mvr (see http://en.wikipedia.org/wiki/Angular_momentum) (2) "expects" --> "would expect" just to exceed 6 char minimum.
Mar
3
comment What are the cloud-like blobs in the Martian southern hemisphere?
@SabreTooth, You could consider to accept the answer.
Mar
1
answered What are the cloud-like blobs in the Martian southern hemisphere?
Feb
15
awarded  Yearling
Feb
12
comment What astronomical observations would give conclusive proof of alien life?
@KeithThompson, I do. If you like, post more references, otherwise just don't. Your last comment is typical of snooty SE "I-am-the-best-you-are-the-last" people.
Feb
12
comment What astronomical observations would give conclusive proof of alien life?
@KeithThompson, Yes it seems you are right, my fault. If you find any other more reliable reference of the definitions, please post it.
Feb
12
comment What astronomical observations would give conclusive proof of alien life?
@KeithThompson, Wikipedia also confirms that, but I would not trust it. Extrasolar planets are planets outside the solar system, exoplanet are exotic planets, i.e., planets that do not follow our models, like supergiants as close to the star as Mercury to the Sun. Rarely in astronomy two different words have the same meaning, but I am not an expert of the field (planets).
Feb
11
comment How long was the hyper inflation phase?
Thanks a lot to you!
Feb
11
comment What astronomical observations would give conclusive proof of alien life?
It seems some telescopes will be able to image extrasolar planets in the near future (20s), but what I meant in the last comment, is the ability to image small structures (trees, plants, buildings), like the ones asked in the OP question.
Feb
11
comment What astronomical observations would give conclusive proof of alien life?
Altough I am not a fan of ET discussions, I still can not see why downvote the question: it is well posed and legitimate. To the OP: imaging of extrasolar planets (not exoplanets) it is still MUCH far way, if ever possible.
Feb
11
comment How long was the hyper inflation phase?
It would be nice to see some calculations from where those numbers come out, if you can. I tried thoroughly through the web, but I did not find anything easily understandable.