All Questions
5 questions
4
votes
1
answer
175
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Is there something close to a consensus on Earth-Sun annual distance increase (speed)?
I've seen estimates varying by an order of magnitude, e.g. (New Scientist)
Having such a precise yardstick allowed Russian dynamicists Gregoriy A. Krasinsky and Victor A. Brumberg to calculate, in ...
3
votes
0
answers
62
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If the distance between galaxies is increasing and the speed of light is constant will the most of the light from the universe ever reach us?
Will the light from other galaxies ever reach us if the universe is expanding?
user31880
10
votes
2
answers
2k
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Exact measurement of a light year
What is the exact measurement of a light year? I searched google for the answer in meters and came up with $9.461\cdot 10^{15}$ meters. When I calculated the answer considering $299\,792\,458 \;\text{...
- 1,311
1
vote
2
answers
494
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How are the speed, distance and time of India's MOM and USA's Maven Mars missions calculated?
How do the scientists calculate the correct time to launch the Mars mission so that the satellite travel time is less? How they are synchronizing the speed of satellite with respect to earth and mars ?...
- 181
26
votes
6
answers
29k
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Is the light we see from stars extremely old?
Our nearest star Proxima Centauri is 4.243 light years away from Earth.
Does that mean we are seeing light that is 4.243 years old everyday?
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