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May
4
asked Would the arms of a rotating ice skater still move outwards if there was no other object in the universe?
May
4
asked Would we feel the rotation of a rotating habitat?
May
4
awarded  Teacher
May
4
awarded  Commentator
May
1
accepted Why can't dark matter be black holes?
Apr
19
asked Why can't dark matter be black holes?
Apr
5
comment Can a neutron star compress until it's converted to a black hole?
is it a coincidence that degeneracy pressure of neutron stars is enough to keep it outside the Schwarzschild radius?
Apr
2
comment Can we prove that the universe is finite or infinite?
not necessarily. the universe could be a fractal. en.m.wikipedia.org/wiki/Olbers'_paradox
Mar
23
accepted Why does the homogeneity of the universe require inflation?
Mar
19
comment Given that matter cannot escape a black hole, how did the big bang produce the universe we see today?
wouldn't energy also attract itself due to gravity even if there was no matter in the beginning?
Mar
19
asked Why does the homogeneity of the universe require inflation?
Jan
13
comment Is there a way to create an artificial solar eclipse?
"it would take an object the size of the moon to totally block out its light" is not entirely true. At the distance of the moon, it would indeed take an object the moons size. At half the distance, it would take half the size object (in diameter). If the blocking object is extremely close to the earth's surface, It would need to be much smaller. A large dense cloud can often block the sun completely. However atmosphere scattering would probably not make it completely dark.
Nov
16
accepted How fast is the Cosmic Microwave Background Radiation (CMBR) changing?
Nov
16
comment Is the CMB rest frame special? where does it come from?
Actually, the answer is to "where the photons come from", and not "where does the rest frame come from"?
Nov
16
accepted Is the CMB rest frame special? where does it come from?
Nov
8
asked Difference between baryonic, inertial and gravitational mass? (and relation to dark matter)
Nov
7
asked Is the CMB rest frame special? where does it come from?
Oct
14
asked How fast is the Cosmic Microwave Background Radiation (CMBR) changing?
Oct
11
comment What makes us think we can actually detect gravitational waves?
I think the trampoline argument may not be 100% accurate. In that, we are travelling on the wave, while in the question, the wave goes through the car as well. In the trampoline example, the car itself would be distorted as per the distortion of the trampoline.
Sep
27
comment Are there planets that do not rotate on their axis?
@Zassounotsukushi: I gather from this article that even for rotation, the sum of all background motion causes the illusion of an absolute frame without any fictious forces.