(a) How long in seconds does it take a radio signal to travel 180 km from a transmitter to a receiving antenna? (b) We see a full Moon by reflected sunlight. How much earlier did the light that enters our eye leave the Sun? The Earth - Moon and Earth - Sun distances are 3.8x105 km and 1.5 x 108 km, respectively. (c) What is the round-trip travel time in seconds for light between Earth and a spaceship at a 9.0 x 106 km distance from Earth? (d) Suppose astronomers observe a supernova about 7600 light-years (ly) distant. How long ago in years did the explosion actually occur? (a) Number Units (b) Number Units (c) Number Units (d) Number Units

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