Question

i will give medals
physical properties used to measure stars include

a) mass
b) brightness
c) size
d) all of the above

Answer 1

well the only thing we can directly measure from stars is the light they emit. However by doing that we can get an idea of how they move and figure out other stuff like their mass. I don't think the question is worded very well though...

Answer 2

The correct answer is D