Across
- 2. these usually come from asteroids or comets, they travel in space without an orbit
- 3. the sun is ¼ made of this gas
- 8. the outer layer of the sun’s atmosphere is called this, it is very visible during a solar eclipse
- 9. he was to first to come up with the geocentric concept of the universe
- 10. this planet’s rings are made mostly of ice and rock
- 13. the solar system was formed from a giant ____
- 14. he discovered the orbits of the planets are ellipses
- 15. gases/heat that erupt into space
- 18. huge loops of gases
- 19. Was able to work out the arrangement of the known planets around the sun
- 20. he thought that the planets moved in small circles carried along bigger circles
- 23. the ___ ___ consists of the sun, 8 planets, their moons and several other smaller objects
- 25. Mars’ atmosphere is made mostly of this gas ___ ___
- 27. most comets are found here, way out beyond Neptune
- 30. the sun is ¾ made of this gas
- 31. he discovered Jupiter’s largest 4 moons
- 34. a piece of meteor that has made it to the surface of the planet
- 36. Earth and ___ are much alike in their size and density
- 37. the largest dwarf planet
- 38. the Inner atmosphere of the sun is called the
- 40. this is the chemical reaction that is happening in the sun, it releases enormous amounts of heat and light
- 42. this object accounts for 99.85% of the mass of our solar system
Down
- 1. the Middle layer of the sun’s atmosphere is called this
- 4. the smallest terrestrial planet
- 5. Jupiter’s big red spot is a ___
- 6. Pluto was designated this in 2006
- 7. model that shows Earth at the center of the solar system
- 11. distance in space is measured in these units
- 12. aside from earth, which inner planet once had liquid water on its surface
- 16. found between Mars and Jupiter- is filled with rocky objects
- 17. areas on the sun that are cooler
- 21. a large chunk of rock that has entered Earth’s atmosphere and is burning up
- 22. they think that the sun will burn out in 5 ___ years
- 24. earth’s solar system is part of the ___ ___ galaxy
- 26. from Earth to the sun is ___AU
- 28. the gas giants are mostly made of this gas
- 29. wind electrical particles coming off the sun
- 32. this area is beyond Neptune’s orbit but before the Oort Cloud
- 33. model that shows the sun at the center of the solar system
- 35. a large chuck of rock smaller than an asteroid floating in space
- 39. means “sun”
- 41. this planet rotates on its side