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






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






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






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






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






6. The brightness of a star when viewed from Earth






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






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






9. The brilliant explosion of a dying supergiant star






10. The study of the universe






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






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






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






14. 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.






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






16. The study of the universe






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






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






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






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






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






22. A graph relating the temperature and brightness of stars






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






24. The increase in wavelength of light due to an object moving away from the observer






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






26. 23.5° - the reason we have seasons

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






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






29. Chunk of rock or dust in space






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






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






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






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






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






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






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






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






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






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






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

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






42. 23.5° - the reason we have seasons

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






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






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






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






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






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






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






50. 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