More cards in this set

Card 16

Front

What are the three main groups on a HR diagram?

Back

Preview of the front of card 16

Card 17

Front

What four reasons may one star appear brighter than another?

Back

Preview of the front of card 17

Card 18

Front

Explain what is meant by one arcsecond

Back

Preview of the front of card 18

Card 19

Front

What conditions are necessary for an object to be a black body?

Back

Preview of the front of card 19

Card 20

Front

Why are there no green stars?

Back

Preview of the front of card 20