Special & General Relativity Questions and Answers
If two ships approach at 2/3 the speed of light, would they see each other?
Yes. Each would see the other's image, but not at the frequency of the light being transmitted and to be reflected, but at a blue-shifted frequency of the returning light.
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All answers are provided by Dr. Sten Odenwald (Raytheon STX) for the NASA Astronomy Cafe, part of the NASA Education and Public Outreach program.