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Astronomy Basics

Subject : 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. All of the frequencies or wavelengths of electromagnetic radiation






2. Large group of stars - dust - and gas held together by gravity; can be elliptical - spiral - or irregular






3. Astronomical telescope that picks up electromagnetic radiations in the radio-frequency range from extra-terrestrial sources






4. Explained movement of planets with retrograde motion






5. A galaxy with a bulge in the middle and arms that spiral outward in a pinwheel pattern






6. The formation of a celestial object by the effect of gravity pulling together surrounding objects and gases






7. The spinning of Earth on its axis






8. Light distance travels in one year (9.5 trillion km)






9. The study of the universe






10. The study of the spectra of stars by analyzing the spectral properties of the light they give off






11. The distance between crests of waves - such as those of the electromagnetic spectrum






12. A faint star of enormous density






13. Influenced by Copernicus; Built observatory and collected data on the locations of stars and planets for over 20 years






14. The rainbow effect when light is dispersed through lens






15. The average distance between the Earth and the sun - or approximately 150000000 km






16. Brahe's assistant - German astronomer who first discovered the three laws of planetary motion (1571-1630)






17. A group of about 30 galaxies that includes the Milky Way






18. The theory that the universe originated 20 billion years ago from the cataclysmic explosion of a small mass of matter at extremely high density and temperature






19. A large cloud of dust and gas that can break apart into smaller pieces and form stars






20. A variable star that brightens and dims regularly - or pulses - and whose distance can be determined from its period of pulsation






21. The motion of a spinning body (as a top) in which it wobbles so that the axis of rotation sweeps out a cone






22. The most distant point in the orbit of the moon






23. Change in the apparent frequency of a wave as observer and source move toward or away from each other






24. An immense cloud of gas (mainly hydrogen) and dust in interstellar space






25. The spectrum of electromagnetic radiation that has passed through a medium that absorbed radiation of certain wavelengths






26. Any of numerous small celestial bodies composed of rock and metal that move around the sun (mainly between the orbits of Mars and Jupiter)






27. The distance between crests of waves - such as those of the electromagnetic spectrum






28. A large body in space that orbits a star and does not produce light of its own






29. Planet with a solid - rocky crust; more dense; Inner planet. Mercury - Venus - Earth - Mars






30. An elongated circle - or oval shape - the shape of the planets orbit






31. The comet discovered in 1705 that repeats itself every 76 years and last appeared in 1986.

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32. A model of the solar system in which Earth and the other planets revolve around the sun






33. A system of two stars that revolve around each other under their mutual gravitation






34. Any of the small solid extraterrestrial bodies that hits the earth's atmosphere






35. A graph relating the temperature and brightness of stars






36. An extremely bright star of very large diameter and low density






37. The apparent westward motion of the planets with respect to the stars






38. Spectrum of electromagnetic radiation emitted by a self-luminous source






39. A faint star of enormous density






40. A model of the universe based on the assumption that the sun - moon - and planets all orbit Earth






41. A measure of the amount of light that a star actually emits






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






43. Point of moon's orbit when it is nearest the earth






44. The average distance between the Earth and the sun - or approximately 150000000 km






45. Large group of stars - dust - and gas held together by gravity; can be elliptical - spiral - or irregular






46. Point in orbit that is closest to the sun - planet moves faster






47. A system of two stars that revolve around each other under their mutual gravitation






48. Massive clouds of dust and gases where stars are born






49. A measure of the amount of light that a star actually emits






50. A star that falls into the main sequence category on the H-are diagram







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