Same thing. See the example above with the sun. Let's say it flashes 10 times a minute (every 6 seconds).
Without relativity, the trip takes 18 minutes, so the Earth observer sees 180 flashes in 9 minutes, twice the actual rate. Relativity says the fast-moving clock is dilated and only flashes 156 times (my guess was off) in those 18 Earth minutes. Still appears faster to the Earth observer. At 0.5c, the Doppler effect doubles the pace, and relativity removes only about a sixth of the pace. — noAxioms
Go through the example, ignoring relativity or not.Pretty sure this is wrong. Doppler changes wavelength/frequency of light. Relativity changes rate of time. Unrelated. — T Clark
Well, yes, the Earth is always accelerating - it is revolving around the sun, which involves acceleration. — T Clark
The Earth is accelerating — Rich
Two measurements, and from each point of view, something is accelerating. — Rich
well isn't saying that anything could be accelerating depending on the viewpoint just as silly? — David Solman
Yes, you should do this. It is covered in 7th grade physics. F=MA or A=F/M which still works even under relativity.Look at the equation. — Rich
That's right. It has to do with knowing what acceleration is.Had nothing to do with GTR. — Rich
You're confusing it with velocity — noAxioms
GTR has zero relevance to biological systems. It's about the problems of measurement. — Rich
The Hafele–Keating experiment was a test of the theory of relativity. In October 1971, Joseph C. Hafele, a physicist, and Richard E. Keating, an astronomer, took four cesium-beam atomic clocks aboard commercial airliners. They flew twice around the world, first eastward, then westward, and compared the clocks against others that remained at the United States Naval Observatory. When reunited, the three sets of clocks were found to disagree with one another, and their differences were consistent with the predictions of special and general relativity. — The Hafele–Keating experiment
There isn't a problem with measurement. Precisely-measured differences in clock tick rates have been observed that are consistent with the predictions of special and general relativity. — Andrew M
Relativity is about RELATIVITY — Rich
Not necessarily. Because of Special Theory of Relativity's Receprocity one can say that Earth is accelerating away from the spaceship, so it is the clocks in the Earth that are slowing down. — Rich
spaceship's engines are accelerating the spaceship, — Michael Ossipoff
"The spaceship's engines are accelerating the spaceship [not the Earth]",
You won't find "Spaceship engines" as a variable in any Relativity equations. — Rich
The rest is literally Sci Fi.
As for interstellar travel, if our civilization ever achieves fast interstellar travel, we'll probably have good enough robotic technology by then, that there won't be a need for humans to be on the starship. — Michael Ossipoff
The robotic probes will, by that time, be able to find out all that we want to know from visits to other solar-systems.
Of course it will take a long time, and so, as you said, it would have to be done as a longterm investment, (if at all).
Regardless of what's accelerating the spaceship, it's being accelerated to (and from) high speed with respect to the Earth — Michael Ossipoff
Or, a person on Earth could look at the spaceship and conclude that the Earth is accelerating away from the spaceship. — Rich
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