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. Chunk of rock or dust in space






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






3. Explained movement of planets with retrograde motion






4. A graph relating the temperature and brightness of stars






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






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






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






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






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






10. 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






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






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






13. Any substance that cannot be broken down into simpler substances






14. 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






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






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






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






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






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






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






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






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






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






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






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






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






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

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






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






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






31. All of the frequencies or wavelengths of electromagnetic radiation






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






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






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






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






36. 23.5° - the reason we have seasons

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






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






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






40. A faint star of enormous density






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






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






43. Any natural satellite of a planet






44. Optical telescope that has a large convex lens that produces an image that is viewed through the eyepiece






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






46. A faint star of enormous density






47. The brightness of a star when viewed from Earth






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






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






50. 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