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






2. 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






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 elliptical motion of a body as it orbits another body in space






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






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






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






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






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






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






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






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






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






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






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






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






17. Planets with low densities and are huge gas giants. Jupiter - Saturn - Uranus - Neptune






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






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






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






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






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






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






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






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






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






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






28. Chunk of rock or dust in space






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






30. A rapidly spinning neutron star that produces radio waves






31. Any of the small solid extraterrestrial bodies that hits the earth's atmosphere






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






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






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

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

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






37. 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






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






39. The study of the universe






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






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






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






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






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






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






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






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






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






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






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