If light from the closest star (other then the sun) took four years to get to Earth...?

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If light from the closest star (other then the sun) took four years to get to Earth...?

and if there was life on a planet orbiting that planet, how long would it take scientist to send a raido wave to that planet and get a reply.

this is a science question for a assinment but it is a estamating question witch has no answer in the book.

2007-03-19 14:44:15 · 2 answers · asked by DRAGON 5 in Science & Mathematics ➔ Astronomy & Space

2 answers

A radio wave travels at the speed of light. A message to the planet would take four years getting there. If there was an immediate response, the reply would take four years coming back. Total time = 8 years.

2007-03-19 14:53:51 · answer #1 · answered by Gene Rocks! 5 · 2⤊ 0⤋

Radio waves are light waves, so it would take a radio signal 4 years to reach the star. And the same on the way back.

2007-03-19 21:47:18 · answer #2 · answered by eri 7 · 3⤊ 1⤋