Across
- 1. -a imaginary pole that earth spins on.
- 4. -the time a planet spins on its axis.
- 7. -a planet that orbits a star outside our solar system.
- 10. -a collection of stars that make a pattern in the sky.
Down
- 2. -change of temperature during the year.
- 3. -one object that circles a other object.
- 5. -any large objects that orbit a star in the solar system.
- 6. -lumps of rock orbiting the sun from when the solar system was made.
- 8. -collection of stars held together by gravity.
- 9. - the time it takes for a planet to orbit the sun.