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PLANETS AND SOLAR SYSTEMS NOTES 1. There are perhaps __________________________ of galaxies in the universe. __________________________, ___________________________, __________________________, ___________________________, __________________________, ___________________________ 2. All these objects spin or _________________ around a center star, our ____________. 3. Our galaxy, the ___________________, orbits around the _______. THREE GALAXY SHAPES 4. __________________________, ___________________________, __________________________ 5. The Milky Way is a ______________________ galaxy. 6. There are ________________________ of galaxies, other than ours, in the universe. Some are very likely able to support life. 7. There are __________________ known planets. 8. The planets are divided into ________________ main groups: _______________________ and ____________________ INNER PLANETS 9. ________________________, _________________________, ________________________, _________________________ 10. The inner planets are ____________________and made of ___________________ and ________________________. OUTER PLANETS 11. ________________________, _________________________, ________________________, _________________________ (not counting Pluto, which has been reclassified as a dwarf planet) 12. The outer planets are __________________ and made of ____________________, _____________________, and ___________. 13. Stars are classified by their different ____________________, which cause them to be different _________________. STAR CLASSIFICATIONS 14. _______________________, __________________________, _____________________________ 15. Stars are born from a cloud of __________ and _____________. 16. These clouds of gas move closer together and form a __________. 17., The ball gets _____________ and starts to make ______________. 18. energy is made, the ball gets ______________ and _________________ until it forms an __________________star. 19. Stars continue to burn for about _________________ years until they ___________________ or use all the __________________ gas that is in them. 20. When all the hydrogen is ______________, the star ____________. 21. All stars turn into ________________________ or _____________________ at the ____________of their lives. RED GIANT 22. During the red giant stage, a star __________________ up so big, it could ____________________ Earth, Venus, and Mercury. 23. As a star continues to grow it ______________________ starts to run out of ______________________. 24. It will _______________________ and _____________________ and become a _____________________ that continues to emit some energy for awhile. 25. When all the energy is ____________________, it becomes a ___________________________ or _____________________star. 26. It is then a _________________ star and creates _________ energy and drifts in space. SUPER GIANT 27. _______________________ are clouds of gas and ___________________ floating between the stars that are ____________________ to form new stars. 28. These clouds of gas and debris floating in space are called ________________________________________. 29. These clouds of dust get ________________________ as they combine together, form __________________ of ______________________, and over a span of ________________________________ of years, form a new _________________. BLACK HOLES 30. formed from ________________________ stars 31. when certain stars die they ________________ a ________________ around them 32. the gravity _______________ faster than the speed of ______________________ 33. makes a ________________ similar to a “_______________________” that sucks anything too close into its spinning core 34. ______________________are basically small _____________________ that move in ___________________ around the sun. 35. Within the Milky Way, there is a huge _____________________ of _____________________________ called an ______________________________________. 36. This belt is found in the ____________________ between two of our planets, ____________________ and _______________________________. This belt contains ______________________ of these ______________________. 37. The ______________________asteroid known is _______________ which is about 640 miles in diameter. ____________________ are small, solid bodies that enter a planet’s __________________________. 38. If a meteor reaches earth ________________, it is called a ______________________________. 39. There have been several __________________________ in the world created by ____________________________. 40. _____________________ are small bodies that are characterized by a long, __________________________________________. 41. Comets __________________________ around the sun and consist of _________________ and ______________________. 42. The _____________________l of a comet is __________________ visible as it passes in _____________________ of the __________________and the reflected light makes the _____________ particles ___________________. 43. The main parts of a comet are the _____________________, ______________________, and the ______________________. 44. Comets are classified into ______________ types, based on the length of the ____________________ it takes them to ___________________________around the _______________ once. 45. ___________________________ are objects that revolve around a _____________________ or _________________________. Example: moon