For every 1,000 feet you climb in elevation, it cools by about degree(s).

a.
1
c.
6
b.
3.5
d.
9.5

If we represent the solar system on a scale that allows us to walk from the sun to pluto in a few minutes, then a) the planets are microscopic and the stars are millions of miles away. b) the planets are the size of basketballs and the nearest stars are a few miles away. c) the planets are marble size or smaller and the nearest stars are thousands of miles away.