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Jan
31
comment Does any satellite communicate only through laser?
I think, this question is about Space Exploration. But here you find some answer: en.wikipedia.org/wiki/Laser_Communications_Relay_Demonstration
Jan
29
comment What would happen if a wormhole gets swallowed by a black hole?
An accurate answer isn't necessarily easy, but it appears to be well within General Relativity, and can be treated within this GR / cosmology framework.
Jan
27
reviewed Approve Identify this 2 axis motorized tripod
Jan
27
reviewed Approve Identify this 2 axis motorized tripod
Jan
27
reviewed No Action Needed how to get image coordinates of source points in saoimage ds9?
Jan
27
answered How is the mass of solar system objects calculated?
Jan
27
reviewed Close Does the Sun impose back it's tidal forces onto the Earth (such as the Earth's to the Moon)?
Jan
27
comment Observing a point 13.82b ly away, 1b years ago
Not a full answer, but maybe it helps to find a full answer: There are several notions of "distance" en.wikipedia.org/wiki/Distance_measures_(cosmology)
Jan
26
reviewed Close Identify this object
Jan
26
comment Identify this object
Could be an unsharp image of a lamp, an aeroplane, the Moon, a star, a planet, whatever. I don't think it's iikely that this can ever be identified uniquely.
Jan
26
reviewed Leave Open Are we one of the first intelligent civilizations in the universe?
Jan
26
comment Are we one of the first intelligent civilizations in the universe?
There are questions we can't answer in detail at the moment. But this doesn't necessarily invalidate the question itself. So I'll vote to leave the question open. Working through the Drake equation is a long-term science objective. Considerable success has been achieved during the latest decades to narrow down some of the parameters..
Jan
26
reviewed Reviewed Public Data Set on Atmospheric Absorbtion / Extinction
Jan
25
reviewed Close Star like light moving in the sky, what could it be?
Jan
25
comment Star like light moving in the sky, what could it be?
Sometimes lamps or lasers point to the sky and illuminate clouds. This can cause similar strange effects. Btw., this may not be legal, sometimes.
Jan
25
reviewed Approve Using the Sun as a Gravitational Lens
Jan
22
comment Gravity assist: why is the velocity doubled?
The question appears to be closer related to Space Exploration than to Astronomy.
Jan
22
reviewed Close Gravity assist: why is the velocity doubled?
Jan
22
reviewed Leave Open Does the quantity of dark matter needed in the Milky Way to give the stars their speed compare with the speed of the Milky Way?
Jan
22
comment Does the quantity of dark matter needed in the Milky Way to give the stars their speed compare with the speed of the Milky Way?
I'm understanding the question as whether the dark matter mass within the galaxies explaining the motion of individual stars is consistent with the motion of the whole galaxies in the galaxy cluster. I don't know the answer for sure, but I think, there is needed additional dark matter outside the galaxies to account for the motion of the galaxies in the cluster.