Alight-year is the distance light travels in one year, at a speed = 2.998 x 10^8 m/s.
(a) how many meters are there in 1.00 light years?
(b) an au is the average distance from the sun to the earth, 1.50 x 10^8. how many au are there in 1.00 light-year?
(c) what is the speed of light in au/h?

What object a collides with object b and bounces back its final momentum is?

The star betelgeuse is about 600 light-years away. if it explodes tonight, a. we'll know because debris from the explosion will rain down on us from space.b. we'll know it immediately because it will be brighter than the full moon in the sky.c. we won't know about it until 600 years from now.d. none of the above.

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