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 rainbow effect when light is dispersed through lens






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






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






4. The apparent westward motion of the planets with respect to the stars






5. 23.5° - the reason we have seasons

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






7. The spinning of Earth on its axis






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






9. The spinning of Earth on its axis






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






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






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






13. 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.






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






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






16. Any natural satellite of a planet






17. Any natural satellite of a planet






18. 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






19. 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






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






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






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






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






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






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






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






27. A space telescope and camera named for a famous astronaut (Edward Hubble) used to study space elements






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






29. The formation of a celestial object by the effect of gravity pulling together surrounding objects and gases






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






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






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






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






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






35. 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






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






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

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






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






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






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






42. Radiation left over from the beginning of the universe






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






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






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






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






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






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






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






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