space

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Across
  1. 1. - A person trained to travel in a spacecraft.
  2. 5. - Small, rocky objects that orbit the Sun.
  3. 6. star - A system of two stars where one revolves around the other or both revolve around a common centre.
  4. 8. - Basic units of matter that every solid, liquid, gas and plasma is composed of.
  5. 9. - The area of air and gas that envelopes Earth and other astronomical objects.
Down
  1. 1. belt - The region between Mars and Jupiter that contains the largest population of asteroids in our solar system.
  2. 2. unit - A unit of measurement that’s roughly the distance from the Earth to the Sun (93 million miles).
  3. 3. dwarf - A star that’s exhausted its own supply of carbon and burnt out - such a cool space term!
  4. 4. Bang - The main theory explaining how the universe started. It states that 13.8 billion years ago, space expanded quickly to form the atoms that would produce stars and galaxies. One of the most important space terms to understand.
  5. 7. - A scientist who studies the universe.