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UNIT D CHAPTER 3 ~ OPEN BOOK TEST NAME ____________________________________ Date ________________ WORD BANK Satellite Orbit Rotation Solar system planet comet outer planets telescope phases revolution axis star asteroid inner planets gas giants space probe 1. A _____________________ is a group of planets and their moons that orbit a central star. 2. Venus is a ____________________ that revolves around the sun. 3. An ____________________ is an imaginary line around which a planet rotates, or spins. 4. Any object orbiting another object is a _________________________. 5. The four planets nearest the sun are called the _______________________. 6. An ________________________ is a rocky object that orbits the sun in a path between Mars and Jupiter. 7. A ______________________ is a vehicle sent into space in order to explore places too dangerous or too far away for people to visit. 8. The path a planet takes around the sun is its ______________________________. 9. A ________________________ is a burning ball of gases. 10. Neptune is one of the four __________________________. 11. A _______________________ is an instrument used to observe distant objects. 12. A ___________________________ is a space object made of ice, dust, and gases. 13. The five planets on the outer side of the asteroid belt are called the ____________________. 14. The moon seems to have different __________________________, or shapes, during a cycle of about 28 days. 15. A year is the time it takes Earth to make one ______________________________. 16. A day is the time it takes Earth to make one _____________________________.