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Solar System Study Guide Answer Key Tuesday, February 28th 1. 2. 3. 4. Constellations are patterns of __stars__ against the night sky. The ____sun______ is the center of the Solar System. The air surrounding Earth is our __________atmosphere_____. Meteors are objects that ___burn_ up as they enter the Earth’s atmosphere. 5. The ______sun__ is the only ___star______ close enough for us to study. 6. Natural satellites that orbit bodies in space are called ___moon_______. 7. The ___asteroid___________ _____belt______ separates the inner and outer planets. 8. The sun and all of the objects that orbit around it is the ____Solar_________ _______System_________. 9. Lumps of ice, rock, frozen gas and dust that orbit the sun are ___________comets__. 10. _______Light Year__________ is a unit used to measure distances between objects is space. 11. The Asteroid Belt is located in space, orbiting the sun between the planets ___Mars_____ and ____Jupiter_______. 12. The curved movement of objects in space around another object in space is called ________orbit_______. 13. _________Mercury____ is the closest planet to the sun. 14. Venus is Earth’s ___sister_______ _planet_________. 15. A well know feature of Jupiter is __________The Great Red Spot_________. 16. The planet closest to Earth in size is _____Venus_________. 17. _____________Venus___ and _______Mercury______ are the only two planets in our Solar System without moons. 18. The Earth’s ___________tilt_____ on its axis causes the Earth’s season. 19. Maria is ______dark spots___________________ on the moon. 20. Waxing is the visible part of the moon _increasing___. 21. Huge collections of stars, gas, and dust traveling through space are ______galaxies______. 22. The four inner planets are ____Mercury______, _______Venus__, _____Earth_______, and ____Mars____. 23. Rings are the main feature of the planet ___Saturn________. 24. Waning is the visible part of the moon _____decreasing__. 25. The smallest planet in our Solar System ___Pluto______ was reclassified as a dwarf planet in 2006. 26. Our Solar System is located in the _____Milky Way_____ galaxy. 27. A _______Black Hole____ is when a massive star has collapsed and pulls everything in, even light. 28. __________Mars___ is known as the “Red Planet.” 29. Asteroids are called ____minor____ planets. 30. _______Comets___ are dirty snowballs with long elliptical orbits around the sun. 31. The five outer planets are _Jupiter______, __Saturn____, ______Uranus__, __Neptune,__ and _____Pluto_______. 32. The inner planets are made of ____rock____, while the outer planets are made of _____gas____.