12 constellations that are in the background of the plane of the solar system

An easy way to find common stars and constellations

This is a scale of brightness

What's the name of the North Star?

__________ magnitude: how bright a star appears from Earth

the apparent shift in a star's position when viewed from one side of Earth's orbit and then the other side 6 month's later

How bright a star is compared to the sun

_____________ magnitude: how bright a star really is

Objects of known brightness

Stars that vary in brightness with a regular cycle

Fusion of Hydrogen INTO Helium only occurs in a star's...

A graph of stars that shows the relationship of star color and luminosity

Gravity pulls a star inward and ____________ pushes outward

Systems containing millions or billions of stars

The closest galaxy to ours

Round or flattened sphere-shaped galaxies

This galaxy is like a regular spiral, but with a bar through the center?

What type of galaxy is the whirlpool galaxy?

These are the most distant objects known in space. They give off 100 times the energy of galaxies

These galaxies have no regular shape

The term used for how sound moves

Galaxies and stars that are further away are

The term for stars/galaxies that are moving towards you

The theory that the universe will eventually stop expanding and will collapse

The theory the big bang and the big crunch occurs in a cycle

Light and sound travels in ______________

If galaxies are moving apart, they were once

14 billion years ago they would have been at a single, incredibly hot and dense point known as the

The universe will continue to expand if there is not enough what?

What is found at the center of galaxies?

Ursa major is known as the

Ursa minor is also known as the

Draco, the constellation, looks like a what?

The constellation Gemini looks like what?

This constellation looks like a lion

This constellation resembles a scorpion

What is the name of our galaxy?

In billions of years, the Milky Way galaxy and the Andromeda Galaxy will...