Ch20 cosmology Flashcards
1
Q
What is an astronomical unit?
A
The average distance between the sun and the earth.
1Au = 1.496e+11m
2
Q
What is a light year?
A
is the distance traveled by moving at the speed of light for a year.
1Ly = 3.0x10^8 x (60x60x24x365)
=9.5x10^15m
