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DSST Astronomy 2
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DSST Astronomy 2
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25 Questions

1. Only one side

2. Twice-yearly point at which the Sun reaches its greatest distance north or south of the equator

3. Galaxy with a very bright center that contains little dust and gas and is spherical to disklike in shape

4. Moon phase that occurs when the Moon is between Earth and the Sun - at which point the Moon cannot be seen because its lighted half is facing the Sun and its dark side faces Earth

5. The sun and stars move across the sky because of this - the stars rotate around Polaris - the North Star and make a complete circle around Polaris.

6. Remnant radiation from the big bang - which we detect using radio telescopes

7. Imaginary great circle on the surface of the earth passing through the north and south poles at right angles to the equator

8. The Milky way observed through a cross section - Our solar system is 27 -000 light years away from the Galactic bulge

9. Every thing revolves around the sun studied by Galelo and Copernicus

10. Closet star to earth - and is a glowing ball of gas made up of 3/4 hydrogen and 1/4 helium - Produces heat by fusion - provides the gravitational pull that keeps our solar system together

11. 23.56 hours

12. A gathering of roughly 30 Galaxies in which the Milky way belongs

13. 29.5 days

14. 1. Mass-Energy Equivalence (when a body has a mass it has a certain energy even if not moving); 2. General Relativity (gravitational attraction between masses is a result of the nearby masses. gravity has waves.)

15. Dense - fusion takes place here (15 -000 -000K)

16. 4.5 billion years

17. Almost directly over the North Pole - and does not seem to move at all. If the star rises perpendicular to the horizon - the observer is standing on the equator

18. The universe originated 13.7 billion years ago from the cataclysmic explosion of a small mass of matter at extremely high density and temperature helium was present - universe is expanding and cooling

19. Occurs when the Moon passes directly between the Sun and Earth and casts a shadow over part of Earth

20. Apparent motion of the planets when they appear to move backwards (westward) with respect to the stars from the direction that they move ordinarily.

21. Caused by the TILT of the Earth. - Summer = Northern hemisphere tilted closer to sun Winter = Northern hemisphere tilted farther from sun.

22. When the Sun becomes a Red Giant - 10 billion years - Then a White Dwarf - aproximately 12 billion years

23. A galaxy that does not fit into any other category;

24. How long does it take for Earth to orbit the sun?

25. Possible since carbon based planets are common - especially on Mars and Alpha Centauri

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