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






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






3. 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






4. The small - dense remains of a high-mass star after a supernova






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






6. A star that expands and cools once it runs out of hydrogen fuel






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






8. The study of the universe






9. Chunk of rock or dust in space






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






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






12. All of the frequencies or wavelengths of electromagnetic radiation






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






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






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






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






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






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






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






20. 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






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






22. 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






23. The brightness of a star when viewed from Earth






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






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






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

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27. The apparent change in position of an object when seen from different places






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






29. Space object made of dust and rock particles mixed with frozen water - methane - and ammonia that forms a bright coma as it approaches the Sun






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






31. The luminous cloud of particles surrounding the frozen nucleus of a comet






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






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






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






35. Space object made of dust and rock particles mixed with frozen water - methane - and ammonia that forms a bright coma as it approaches the Sun






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






37. Italian astronomer - mathematician - and physicist. His telescopes proved the sun is the center of the solar system and that the planets/moon move. He was persecuted for supporting Copernicus' ideas.






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






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






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






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






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






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






44. When the northern or southern most point on earth receives the most sun because the earth is tilted toward the sun






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






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






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






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






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






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







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