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13 Cards in this Set

  • Front
  • Back
astronaut
a person who travels in space
axis
an imaginary straight line through the center of the Earth. Earth rotates round this line.
crater
a large hole in the ground that is shaped like a bowl
orbit
the path an object follows as it moves around another object
phase
the shape of the lighted part of the moon
planet
a large body of matter (stuff) that moves around a star such as the sun
revolution
movement of an object in an orbit around another object
rotate
to spin on an axis
satellite
an object that revolves around another object
solar system
the sun, the planets and their moons, and other objects that move around the sun
star
a very large mass of hot, glowing gases
telescope
an instrument used to make distant objects appear nearer and larger
tide
the rise and fall of the ocean, mainly due to the moon's gravity