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 group of stars that form a pattern in the sky






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






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






4. The motion of a spinning body (as a top) in which it wobbles so that the axis of rotation sweeps out a cone






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






6. A faint star of enormous density






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






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






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






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






11. The spectrum of electromagnetic radiation that has passed through a medium that absorbed radiation of certain wavelengths






12. A faint star of enormous density






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






14. The name of our galaxy - a spiral galaxy that contains about 400 billion stars






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






16. A faint star of enormous density






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






18. The brilliant explosion of a dying supergiant star






19. Explained movement of planets with retrograde motion






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






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






22. Radiation left over from the beginning of the universe






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






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






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






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

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27. 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






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






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






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






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

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






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






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






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






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






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






38. Explained movement of planets with retrograde motion






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






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






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






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






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






44. The spectrum of electromagnetic radiation that has passed through a medium that absorbed radiation of certain wavelengths






45. 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.






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






47. A rapidly spinning neutron star that produces radio waves






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






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






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