Gravity and the Universe

Galaxy

A large system of stars, gas, dust, and dark matter held together by gravity, with billions of stars orbiting around a central core.

Nebula

A giant cloud of gas and dust in space, often the birthplace of stars and planets.

Spiral Galaxies

A rotating disk of stars and gas with a central bulge, often containing spiral arms that extend outward from a central bulge and have active star formation.

Elliptical Galaxies

A type of galaxy with a smooth, rounded shape and a lack of distinct features like spiral arms, often containing older stars and minimal gas.

Irregular Galaxies

Galaxies that are oddly shaped, often composed of young stars and high amounts of gas and dust.

Black Hole

A region in space where the gravitational pull is so strong that nothing, not even light, can escape from it; formed from the remains of massive stars after a supernova.

Gravity

An attractive force that exists between all objects that have mass.