A large rock or gas, usually has a liquid core and is sphere shaped that is orbiting a star

Large ball of burning gas seen from earth as a point of light

He discovered the laws of gravity

Consist of a flat, rotating disc containing stars, gas and dust, and a central concentration of stars known as the bulge

The belief that the planets revolve around the sun

The brightest planet in our solar system

An ordinary star at a stable point in it's devolution

Discovered moons revolving around Jupiter

Type of galaxy having an approximately ellipsoidal shape and a smooth, nearly featureless brightness profile

The belief that the planets revolve around the earth

The eighth planet in our solar system named after the god of the sea

Bright objects emitting X-rays as a primary component of it's radiation

Believed in Heliocentric model

Having a lot of gas and dust means that these galaxies have a lot of star formation going on within them.

A theory according to which the universe began billions of years ago in a single event, similar to an explosion

Made from the same material as Mercury ninth in order from the sun

Constellation also known as the little bear

His discovery that black holes emit radiation making their detailed study possible

The galaxy that contains our Solar System. Its name is derived from its appearance as a dim glowing band arching across the night sky whose individual stars cannot be distinguished by the naked eye

The theory that any two particles of matter attract one another with a force directly proportional to the product of their masses and inversely proportional to the square of the distance between them

The yellow dwarf star in our solar system

The star found in Ursa Minor

Believed in the geocentric model

Discovered first actual proof of the Milky Way

Einstein's theory that created the idea that light exists as tiny packets, or particles, which he called photons.