VocabularyUnit 3

Week 3

Galaxy: A group of millions of stars.

Billion: One with nine zeroes.

Energy: The force that makes things happen.

Million: One with six zeroes.

Planets: A natural object orbiting a star.

Asteroids: Rocky, airless minor planets that orbit a sun.

Astronaut: A person trained to go into space.

Liquid: A fluid that takes the shape of it’s container.