Test your basic knowledge |

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






2. A spectrum of light in which there are no gaps - so that each region blends directly into the next






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






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






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






6. Galaxy with no particular shape - contains new & old stars






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






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






9. Remnant of a star that is so dense that nothing - not even light - can escape its gravity field






10. Radiation left over from the beginning of the universe






11. A contracting cloud of gas and dust with enough mass to form a star






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






13. The place in the orbit of a planet where the planet is farthest from the sun






14. The elliptical motion of a body as it orbits another body in space






15. A region of the solar system that is just beyond the orbit of neptune and that contains small bodies made mostly of ice






16. A spherical region of comets that surrounds the solar system






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






18. When the moon passes between earth and the sun - blocking the sunlight from reaching earth






19. The spinning of Earth on its axis






20. A graph relating the temperature and brightness of stars






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






22. Explained movement of planets with retrograde motion






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






24. 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






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






26. Any natural satellite of a planet






27. Stony or metallic object that is the remains of a meteoroid that has reached the earth's surface






28. A group of stars that form a pattern in the sky






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






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

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31. A contracting cloud of gas and dust with enough mass to form a star






32. A spectrum of light in which there are no gaps - so that each region blends directly into the next






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






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






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






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






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






38. A very small star with low temperature - reddish in color






39. The elliptical motion of a body as it orbits another body in space






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






41. The brilliant explosion of a dying supergiant star






42. The brilliant explosion of a dying supergiant star






43. The theory that states that gravity will over come the expansion of the universe and bring everything together in an implosion






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






45. English mathematician and physicist - discovered the law of universal gravitation






46. All of the frequencies or wavelengths of electromagnetic radiation






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






48. The brightness of a star when viewed from Earth






49. 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






50. Polish astronomer who produced a workable model of the solar system with the sun in the center (1473-1543)