"Why is Mars considered to be the most likely candidate for life elsewhere in the solar system, and not Europa?"
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Question
How may years would a radio signal take to reach the nearest large galaxy to us, the Andromeda Galaxy?
The time for an electromagnetic wave (such as a radio signal) to reach any object is equal to its distance in light years -- roughly 2.9 million years in the case of the Andromeda Galaxy.
David Morrison
NAI Senior Scientist
September 24, 2003
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- Have aliens visited Earth? Are UFOs real?
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- Astrobiology Career Path Suggestions
