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20 Cards in this Set

  • Front
  • Back
What is a solar system?
a sun and all the objects that move around it
What is a galaxy?
a group of millions of stars
What is an orbit?
the path that one object in space takes around another object in space
What is an asteroid?
a large space rock that orbits the sun
What is a meteoroid?
a small space rock that orbits the sun
What is a comet?
a mountain-sized chunk of ice and dust that orbits the sun
What is a solar eclipse?
the moon casting a shadow on Earth
What is atmosphere?
the air that surrounds Earth
If the sun were hollow, how many Earths could it hold?
1.3 million
All life on earth, weather, and our climate depend on what?
The Sun
What is a moon?
a natural object that orbits a planet
What is the Milky Way?
the galaxy that our
Solar System is part of
What feature of the Earth causes us to have seasons?
The Earth is tilted a little to one side.
What is a manned journey into space?
a journey that includes human beings
What is an unmanned journey into space?
a journey that includes no humans, but only scientific equipment to collect data
What are the main gases in Earth's atmosphere?
nitrogen and oxygen
If Earth's gravity equals 1, what is Mars' gravity?
About how many days does it take Earth to revolve around the sun?
How far from the Sun is Earth?
93 million miles
How many rings does Neptune have?