Test your basic knowledge |

DSST Astronomy 2

Subjects : dsst, science
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

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






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






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






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






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






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






7. 4.5 billion years






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






9. 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.






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






11. 29.5 days






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






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






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






15. 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






16. 3 laws of Planetary Motion: 1. orbits are elliptical 2. Planets revolve at varying speeds 3. Planets revolve in proportion to distance from Sun


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






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






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






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






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






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


23. 23.56 hours






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






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






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






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






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






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






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






31. 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






32. Only one side






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






34. 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






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






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






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






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






39. 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.)






40. 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






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






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






43. Bright regions seen in the solar chromosphere






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






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






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






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






48. 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


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






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