PLEASE HELP

1. Which description best summarizes the steps that take place during black hole formation, in the correct order?

Supernova explodes a massive star; remaining core expands; nuclear reactions diminish the effects of gravity.

Supernova triggers fusion reactions; massive star implodes due to extreme radiation; volume and mass of star increase rapidly.

A massive star depletes its nuclear fuel; gravity overpowers the star; supernova occurs; core of star collapses.

A small star gains mass through fusion reactions; core of star collapses; increased radiation triggers a supernova.

2. Astronomers think that most galaxies are centered by a (nebula, large planet, black hole, massive star), which exerts (centripetal force, magnetic pull, gravitational pull, centrifugal force) that binds the galaxy together.

3. Where would scientists look to observe a black hole?

The center of the Milky Way

The center of the sun

The solar system asteroid belt

The edge of the solar system