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Unformatted text preview: Arcturus is at a distance oF 11.3 parsecs From the Earth; Vega is at a dis-tance oF 7.76 parsecs From the Earth. What is the ratio oF the luminosity oF Arcturus to the luminosity oF Vega? 10) The star Proxima Centauri has a mass 0 . 12 M sun , where M sun is the Sun’s mass. Also, Proxima Centauri has a luminosity 0 . 00014 L sun , where L sun is the Sun’s luminosity. IF the Sun’s liFespan is t sun = 10 billion years, what is the liFespan oF Proxima Centauri? Essay Question 11) Our crotchety old pal “±lat Earth ±red” reFuses to believe that exoplanets (planets around stars other than the Sun) exist, since astronomers haven’t been able to take pictures oF them. Write an explanation, in simple terms that a non-spet like ±red can understand, oF either the radial velocity method or the transit method For ²nding planets....
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This note was uploaded on 07/17/2008 for the course ASTRO 294 taught by Professor Ryden during the Winter '08 term at Ohio State.
- Winter '08