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






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






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






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

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






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






7. A graph relating the temperature and brightness of stars






8. A star that ejects some of its material in the form of a cloud and become more luminous in the process






9. A telescope that uses a curved mirror to collect and focus light






10. One of the small asteroid-like bodies that formed the building blocks of the planets






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






12. An enormously bright - distant galaxy with a giant black hole at its center






13. Chunk of rock or dust in space






14. A star that ejects some of its material in the form of a cloud and become more luminous in the process






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






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






17. Every object in the universe was attracted to every other object w/ a force that is directly proportional to the masses and proportional to distance between them






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






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






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






21. A faint star of enormous density






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






23. A rapidly spinning neutron star that produces radio waves






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






25. A particle of electromagnetic radiation having zero mass and carrying a quantum of energy






26. A space telescope and camera named for a famous astronaut (Edward Hubble) used to study space elements






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






28. The decrease in wavelength of light due to an object moving away from the oberver






29. Explained movement of planets with retrograde motion






30. Varying amounts of the lighted moon as seen from earth






31. The spinning of Earth on its axis






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






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






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






35. 23.5° - the reason we have seasons

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36. A telescope that uses a curved mirror to collect and focus light






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






38. 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






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






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






41. A system of galaxies containing from several to thousands of member galaxies






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






43. A galaxy shaped like a flattened ball - containing only old stars






44. A rapidly spinning neutron star that produces radio waves






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






46. All of the frequencies or wavelengths of electromagnetic radiation






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






48. The farther away a galaxy is - the faster it is moving away

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49. The rainbow effect when light is dispersed through lens






50. The increase in wavelength of light due to an object moving away from the observer