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






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






3. 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






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






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






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






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






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






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






10. Any natural satellite of a planet






11. A faint star of enormous density






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






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






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






15. 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






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






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






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






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






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






21. A shift toward the red end of the spectrum in the observed spectral lines of stars or galaxies showing objects are moving away and that the universe is expanding






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






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






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






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






26. 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






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






28. A faint star of enormous density






29. Any natural satellite of a planet






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






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






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






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






34. A graph relating the temperature and brightness of stars






35. The brightness of a star when viewed from Earth






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






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






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






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






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






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






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






43. The spinning of Earth on its axis






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






45. 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






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






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






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

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






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