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. The two days of the year on which neither hemisphere is tilted toward or away from 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. A contracting cloud of gas and dust with enough mass to form a star






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






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






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






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






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

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






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






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






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






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






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






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






16. The distance between crests of waves - such as those of the electromagnetic spectrum






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






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






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






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






21. The brightness of a star when viewed from Earth






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






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






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






25. A faint star of enormous density






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






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






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






29. A region of the solar system that is just beyond the orbit of neptune and that contains small bodies made mostly of ice






30. 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






31. Planet with a solid - rocky crust; more dense; Inner planet. Mercury - Venus - Earth - Mars






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






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






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






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






36. The brilliant explosion of a dying supergiant star






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






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






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






40. A graph relating the temperature and brightness of stars






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






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






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






44. The spinning of Earth on its axis






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






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






47. Chunk of rock or dust in space






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






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






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