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Flashcards

Astronomy

melurvunicorns Exam Prep 9 9 English 51 cards

just memorize this >>>>

Cards in this deck (51)

  1. 1just memorize this >>>>just memorize this >>>>
  2. 2what happens in a lunar eclipse?we cannot see the moon or if we do see it, it appears red
  3. 3what happens in a solar eclipse?we cannot see the Sun, only the corona which appears to be a halo
  4. 4why is a total eclipse of the Sun very rare?the moon and earth revolve at different angle, and it is also required that Venus and the moon line up directly in front of the Sun
  5. 5—new moonnew moon
  6. 6—waxing crescentwaxing crescent
  7. 7—first quarterfirst quarter
  8. 8—gibbous waxinggibbous waxing
  9. 9—full moonfull moon
  10. 10—gibbous waninggibbous waning
  11. 11—waning crescentwaning crescent
  12. 12what is the reason for the seasons?the earth is at a tilt, so when the rays from the sun hit a sire of it, some places receive a higher concentration of light, and as the earth revolves around the sun, the concentration of these rays change
  13. 13name the order of the planets from the Sunmercury, venus, earth, mars, jupiter, saturn, uranus, neptune
  14. 14why is venus hotter than mercury?Venus has a lot of carbon dioxide, trapping heat
  15. 15what is earth's only satellite?the moon
  16. 16what is a satellitea celestial object that revolves around a planet or dwarf planet
  17. 17why do satellites need to be launched with optimal velocity?the gravity of the earth constantly pulls it down, but with enough velocity, the satellite will follow the curvature of the earth
    BTW this is called continuous earth orbit
  18. 18what is the range a low-earth satellite orbits at200-900km
  19. 19what are low-earth satellites used formilitary or earth observation, natural disaster response and natural and human made events
  20. 20what does GPS stand forglobal positioning system
  21. 21at what distance does a GPS satellite orbit at11000 km
  22. 22what does a GPS satellite do?transmits signals to GPS receivers on the ground
  23. 23how many GPS satellites must be visible to a GPS receiver are any time3
  24. 24what distance does a geostationary satellite orbit at35 790 km
  25. 25why is the orbital period of a geostationary satellite significant?it matches the period of rotation of the earth, making appear motionless in the sky
  26. 26what are geostationary satellites used forweather forecasting, satellite Tv and radio broad-casting
  27. 27what are the four terrestrial planetsmercury, venus, earth, mars
  28. 28what are the four gas giantsjupiter, saturn, uranus, neptune
  29. 29if all the gas giants have rings, how come only Saturn's were found early?Saturn's rings are reflective- all the rings were made of gas so it's hard to see
  30. 30what is a galaxy?a collection, of gas, dust, and about 200 billion stars
  31. 31what is at the center of the galaxy?a super massive black hole
  32. 32what is precessionthe changing direction of the earths axis
  33. 33what is rotationa planet spinning on its axis
  34. 34what is a revolutionthe planet or celestial object making a full orbit around the star or object there are orbitting arounf
  35. 35how are tides created?the moon's gravity stretches the earth
  36. 36what is an astronomical unitthe distance from the earth to the sun, about 150 million km
  37. 37what is a light yearthe distance that light travels in a year
  38. 38what is a nebulaa huge cloud of gas and dust
    the beginning of a star
  39. 39what are red giantsstars near the end of its life cycle with a mass that is equal to or smaller than that of the Sun
  40. 40what are white dwarfssmall, dim and hot stars created by the remains of a red giant after it dies
  41. 41name the different colours of a star in order from hottest to coldestblue>>bluish white>>white>>whitish yellow>>yellow>>orange>>red
  42. 42what are neutron starsextremely dense stars made of tightly packed neutrons
  43. 43what are the four different types of galaxiesspiral, elliptical, linticular, irregular
  44. 44what do spiral galaxies have in the center, when looking on an edge viewa bulge
  45. 45what are quasarsyoung galaxies that look like faint stars and emit up to 100 times for energy than our entire galaxy
  46. 46what is the closest galaxy to us?Andromeda
  47. 47how can you tell if you are seeing a starthey twinkle
  48. 48what is apparent magnitudethe brightness of a starbthe way the appear in the night sky
  49. 49what is absolute magnitudethe brightness of a star if they were 33 ly away from earth
  50. 50what is luminositythe total amount of energy a star produces each second
  51. 51why is Pluto no longer a planetit does not dominate its orbit

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9 Exam Prep 9 (Science) Flashcards on Astronomy, created by melurvunicorns on 24/01/2015.
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