1.) Which main-sequence stars on the Hertzsprung-Russell (H-R) diagram are the least massive?


blue


orange


red


yellow


2.) Stars of which color have the highest surface temperature?


red


orange


blue


yellow

3.) Neutron stars, smaller than white dwarfs, are thought to be remnants of _____.


supernova events


red giants


black holes


nucleosynthesis

4.) Another name for the interstellar matter that will eventually form a star is _____.


supernova


red giant


black hole


nebula

5.) What theory states that the universe began in a violent explosion?


big bang


Hubble’s law


big crunch


Doppler effect