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May
3
comment Why does the Solar System have no (natural) satellites of satellites?
Are you referring to the Kozai-Lidov effect? This only works for sufficiently inclined orbits, but orbits (around the moon) in the same plane as the Moon-Earth orbit should be stable (Solar tides are much weaker and the inclination is small).
May
3
comment Star versus Black Hole
@SwapnilRastogi As I said in the answer, some of the stellar matter [from the star ripped apart] forms an accretion disc around the BH. This is essentially all matter that is gravitationally bound to the BH. The remainder escapes. If the star was initially on a parabolic orbit (which to good approximation is the typical situation), half of the gas from the star will accrete and the other half escape.
Apr
29
revised How can a supernova affect black hole in a binary system?
typo
Apr
29
answered Star versus Black Hole
Apr
28
answered Could our Sun be a companion star of a massive black hole?
Apr
14
comment Can stars be observed from space by x-rays, near infrared and radio wavelengths?
No, "seen" implies the human eye, which is incapable of sensing in these wavelengths. Or didn't you mean that?
Apr
12
answered Can we know the orbital planes of extraterrestrial planetary bodies?
Mar
10
revised What is the term for astronomical objects outside the solar system that are smaller than dwarf planets?
added 387 characters in body
Mar
9
answered What is the term for astronomical objects outside the solar system that are smaller than dwarf planets?
Feb
27
comment Fourier Transform of Galaxy Images
The Fourier transform per se will not help you to find overlapping object. Where does this idea come from?
Feb
27
answered Is gravitational energy released when a body contracts?
Feb
18
awarded  Nice Answer
Feb
6
answered How do moons get captured?
Feb
6
answered Why there are other planets in our solar system?
Feb
6
comment Why there are other planets in our solar system?
Are you asking for the reason (that there are planets) or for their purpose?
Feb
6
comment Why there are other planets in our solar system?
Why are there other people on this planet. Only I am important. What is the significance of others, such as user804401? I receive food from the plants and animals. In a similar way do I receive any food from other people?
Feb
6
comment Does one need to take into account finite gravity speed in N-body simulations?
Most large-scale N-body simulations (e.g., stellar clusters, galaxies, galaxy clusters, ...) use general relativity Wrong For up to galaxy scales, one safely uses Newtonian gravity. For larger scales (so-called cosmological $N$-body simulations), one uses GR only to describe the (assumed) smooth background (universal expansion), but Newtonian physics otherwise.
Feb
6
revised Why are all quasars so far away?
added 122 characters in body
Feb
6
comment Galaxy rotation curve and dark matter
The authors of that book should have mentioned the caveat, that it only introduces a small error, and that in the scientific literature (of which that book is no part) such simplifications are not made (unless the errors introduced are far smaller than other sources of error). If they did not, then this is just another example of poor practice in presenting science to the public.
Feb
6
revised Galaxy rotation curve and dark matter
added 480 characters in body