All Questions
7
questions
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How would a spacecraft travelling near light speed say 0.9c compensate for time dilation in radio communication from spacecraft to earth?
For a spacecraft travelling at 0.9 c for 5 seconds, only 5 seconds would have passed for an observer on Aircraft, while 26.31 second would pass for a stationary observer watching from Earth.
In a ...
2
votes
1
answer
546
views
How do they set the clocks on spacecraft visiting several other planets?
Scientists have sent spacecraft into distant space passing nearby other planets on the voyage. How do they set the clocks to adjust for kinetic time dilation (special relativity) and gravitational ...
- 4,783
0
votes
2
answers
107
views
For someone staying on Earth, what is the minimum possible time to send a spaceship to Alpha Centauri and have it back?
Suppose we want to send a spaceship to Alpha Centauri and calculate the minimum possible time it will take for us here on Earth to have the spaceship back. We are not interested in how fast the time ...
- 3
1
vote
3
answers
340
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Questions on the notion of an inertial frame of reference
Imagine an astronaut flying in an spaceship at a constant speed in completely empty space, with no acceleration whatsoever, and no outside references, just dark empty space.
Q: Can the astronaut tell ...
2
votes
1
answer
63
views
If 2 spaceships left Earth for the galactic centre, travelling near the speed of light, but they left an hour apart, would they arrive an hour apart?
If a spaceship left Earth for the galactic center at 3pm one day, traveling at extremely close to the speed of light (say 99.9999999%), then a second spaceship left at 4pm, would they arrive an hour ...
- 1,107
1
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96
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Travel huge distance in a short time
I know that according to the thought experiment by einstein, one who would travel at speed close to light's speed would not age and those on earth would age.
But is it possible for someone to travel ...
- 129
2
votes
4
answers
227
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How much could one slow down aging using existing spacecraft?
Imagine that I board a spacecraft and head away from the Earth at top speed until I've aged twenty years, then I turn around and come back. How much younger will I be than the unexciting folk who hung ...
- 287