Learn Key Vocabulary

Rate and Study the Words Rate how well you know each word. Then:

  • 1. Pronounce the word. Say it aloud several times. Spell it.

  • 2. Study the example.

  • 3. Tell more about the word.

  • 4. Practice it. Make the word your own.

Rating Scale

  • 1 = I have never seen this word before.

  • 2 = I am not sure of the word’s meaning.

  • 3 = I know this word and can teach the word’s meaning to someone else.

Key Words
space (spās) noun
illustration of a telescope inside an observatory
Space is a big and unlimited area. Scientist use tools like this telescope to look into outer space.		solar system (sō-lur sis-tum) noun
illustration of a diagram of the solar system
The solar system is the sun and all the planets, moons, and comets that move around it. Earth is part of the solar system.
rocket (rok-it) noun
photograph of the space shuttle lifting off
A rocket is a machine that burns fuel very quickly and moves very fast. Rockets can be used to send people into space.		moon (mūn) noun
photograph of the moon
A moon is any object that revolves, or turns, around a planet. Earth has one moon.
astronauts (as-tru-nots) noun
photograph of a male astronaut inside the space shuttle
Astronauts are people who fly into space to study the solar system. Some astronauts live on space stations for weeks at a time.		Practice the Words With a partner, make a Vocabulary Study Card for each Key Word.
Write the word.
front

front

Tell what the word means and use it in a sentence.
back

back

Use the cards to quiz your partner. Take turns answering.