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11h
reviewed Approve suggested edit on Why don't planets give off their own light?
2d
reviewed Approve suggested edit on What is the secret behind the existence of gravitational force?
Aug
16
revised Contradiction between Theory of Relativity and Newton's Law of Universal Gravitation?
statement about wrong chart
Aug
16
answered Contradiction between Theory of Relativity and Newton's Law of Universal Gravitation?
Aug
16
awarded  Custodian
Aug
16
reviewed No Action Needed Is it possible to extend the life of a star?
Aug
16
reviewed Approve suggested edit on big-bang-theory tag wiki excerpt
Aug
15
comment Infinite universe? How?
The Friedmann equations are much more general than either the vacuum condition or being spatially infinite. The whole section is more than a bit confused. @HDE226868 The implication, which this answer alludes to but fails to communicate clearly, is that the WMAP observations indicate spatially flatness, which under the modeling assumptions of the FRW family of solutions (global isotropy and homogeneity) would imply an infinite universe.
Aug
15
comment Infinite universe? How?
Your main error is in the following: "So it came from a singularity, and had a finite size at some point." This implication is completely wrong about the universe at large. Your subsequent error is this: "That's too crazy to swallow." That's just appeal to personal incredulity.
Aug
4
comment Can there be an infinity of humans in the Universe?
The kinds of numbers that answer "how many?" are called cardinal numbers--they are the generalization of counting, and include non-finite amounts. So when you say things like "it's obviously a smaller infinity" or "which is a much bigger infinity", you are mistaken, primarily because that's not how cardinal numbers work. But also because your claims are not at all obvious even if they were correct.
Aug
3
reviewed Approve suggested edit on Determining planetary positions on the celestial sphere by Right Ascension and Declination
Aug
3
reviewed Approve suggested edit on What is the maximum number of planets in the habitable zone?
Aug
3
reviewed Approve suggested edit on Generalised planets?
Aug
2
comment Can there be an infinity of stars in the Universe?
+1, though under the assumptions of large-scale homogeneity and isotropy (which are motivated mainly by cosmic background radiation), there are four qualitatively different kinds of possible spatial geometries, two of which are infinite (Euclidean $3$-space and hyperbolic $3$-space).
Aug
2
comment Can there be an infinity of stars in the Universe?
Your 'Answer A' assumes that $W$ is a finite value and then concludes that it's a finite value. It's a clear case of begging the question.
Aug
2
comment Can there be an infinity of stars in the Universe?
-1 the first two paragraphs are complete nonsense. The third effectively substitutes "observable universe" for "universe", a qualifier that is not present in the question.
Jul
30
reviewed Approve suggested edit on Does near light-speed travel doppler-shift the light from the target into gamma rays?
Jul
30
reviewed Approve suggested edit on Where does the Milky Way end?
Jul
30
reviewed Approve suggested edit on Could a habitable satellite of a gas giant have a stable subsatellite?
Jul
22
comment Are these facts about moon true?
@SF.: Good point--you're right, the conclusion is unchanged. Though the seismic disconfirmation of hollow moon would be a different issue than what was addressed here.