Test your basic knowledge |

DSST Astronomy 2

Subjects : dsst, science
  • Answer 50 questions in 15 minutes.
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  • Match each statement with the correct term.
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This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. 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.

2. 23.56 hours

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

4. Earth's average distance from the Sun - which is approximately 150 million kilometers.

5. 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

6. The phase of the Moon when a decreasing amount of the Moon's near side is sunlit

7. Earth is the center of the universe. Aristotelian.

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

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

10. The phase of the moon in which three-fourths of the moon's side that faces earth is illuminated

11. Sudden - violent eruption of electrically charged atomic particles from the sun's surface

12. 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

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

14. 29.5 days

15. Apparent line in the distance where the sky meets the sea or land

16. A cycle of rise and drop in the ocean; caused be the gravitational pull of the Earth - Sun - and Moon.

17. A twice-monthly tide of minimal range that occurs when the Sun - Moon - and Earth are at right angles to each other - thus decreasing the total tidal force exerted on Earth causes North South pull

18. Example of a natural satellite - Earth's natural satellite

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

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

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

22. Galaxy with a bulge in the middle and arms that extend outward in a pinwheel pattern

23. Thick distribution of warm gas and stars around the galactic center.

24. 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

25. Phase that occurs when all of the Moon's surface facing Earth reflects light.

26. Only one side

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

28. Point above the observer that is directly opposite the nadir on the imaginary sphere against which celestial bodies appear to be projected

29. The phase of the moon in which only a curved edge of the moon's side that faced earth is illuminated

30. Highest tidal range that occurs to the alignment of Earth - the moon - and the sun - East West pull

31. Bright regions seen in the solar chromosphere

32. 3 laws of Planetary Motion: 1. orbits are elliptical 2. Planets revolve at varying speeds 3. Planets revolve in proportion to distance from Sun

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

34. 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.)

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

36. 4.5 billion years

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

38. Jets of hot gas that extend from the Sun to around 20 -000 kilometers beyond the photosphere.

39. The phase of the Moon when an increasing amount of the Moon's near side is sunlit

40. Cooler and not as bright as the surrounding areas and that is caused by the sun's magnetic feild

41. New moon - (waxing or waning) crescent moon - quarter moon - (waxing or waning) gibbous moon - and full moon

42. Two days of the year on which neither hemisphere is tilted toward or away from the sun

43. Alpha Centauri - 4.37 light years away OR Proxima Centauri - 4.24 light years away

44. Imaginary sphere surrounding Earth on which celestial bodies are projected.

45. 1. an object at rest willl stay at rest - and an object in motion will stay in motion at constant velocity unless acted upon by an unbalanced force 2. force = mass X acceleration 3. for every action there is an equal and opposite reaction

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

47. 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

48. The blocking of sunlight to the moon that occurs when Earth is directly between the sun and the moon

49. Sky as seen from wherever you happen to be standing; appears to be hemisphere or dome; only half of celestial sphere

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