Nearest star beyond the sun?

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Nearest star beyond the sun?

The nearest star beyond the sun is Alpha Centauri which is 4.2 x 10^16 meters away. If we were to recieve a radio message from this star today how long ago would it have been send?

2007-02-25 10:42:03 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Physics

3 answers

Alpha Centauri is between four and four and a half light years away. If we were to receive a message from this star, it would have been sent between four and four and a half years ago.

2007-02-25 10:45:29 · answer #1 · answered by msi_cord 7 · 1⤊ 0⤋

Radio waves are a form of electromagnetic radiation. This travels through space at a speed of 3.0 x 10^8 m/s.

d = v t

4.2 c 10^6 m = 3.0 x 10^8 m/s (t)

2007-02-25 18:46:55 · answer #2 · answered by physandchemteach 7 · 0⤊ 0⤋

over 4 years ago?

2007-02-25 18:45:44 · answer #3 · answered by Anonymous · 0⤊ 0⤋