Front

What is the color of the coolest stars?

Back

Red

Front

The __________ has planets, moons, comets, and asteroids.

Back

solar system

Front

Approximately how old is the universe?

Back

13.7 billion years

Front

A star is born in a cloud of gas and dust called a __________.

Back

nebula

Front

All stars (and most of the visible universe) are made up of which two elements?

Back

Hydrogen and Helium

Front

What is the center of our solar system?

Back

The Sun

Front

What is the name of the galaxy that contains our solar system?

Back

The Milky Way

Front

What force keeps the planets in orbit around the Sun?

Back

Gravity

Front

What is the term for a group of stars, gas, and dust bound together by gravity?

Back

Galaxy

Front

What is the largest planet in our solar system?

Back

Jupiter