Galaxies are big formations in space that move around and carry stars and solar systems. Every galaxy has a black hole in it's center. We are in the Milky Way galaxy and it has been named that because the stars look like milk when you look at them from far away.

Our solar system has:

The Sun

Mercury

Venus

Earth

Mars

Jupiter

Saturn

Uranus

Neptune And also the asteroid belt.

Black holes have 2 types.

Stellar black holes come after a massive star dies.

A supermassive black hole is usually in the middle of a galaxy, and have a mass of billions of stars.

White dwarfs are stars that have lost all their energy and can't make fusion reaction happen.

As a result, it's planets that would surround it would go cold forever or might exit the solar system.