(a) The distance to a star is approximately 4.2e18 m. If this star were to burn out today, in how many years would we see it disappear?
___ years
(b) How long does it take for sunlight to reach Jupiter?
___ minutes
(c) How long does it take for a microwave radar signal to travel from Earth to the moon and back?
___ seconds
(d) How long does it take for a radio wave to travel once around the earth in a great circle, close to the planet's surface?
___ seconds
(e) How long does it take for light to reach you from a lightning stroke 10.0 km away?
___ seconds