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. Massive clouds of dust and gases where stars are born






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






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






4. 23.5° - the reason we have seasons

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5. Any natural satellite of a planet






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






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






8. 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






9. A faint star of enormous density






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






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






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






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






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






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






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






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






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






19. Explained movement of planets with retrograde motion






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






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






22. A rapidly spinning neutron star that produces radio waves






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






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






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






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






27. 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






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






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






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






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






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






33. 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






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






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






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






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






38. A faint star of enormous density






39. The study of the universe






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






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






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






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






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






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






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






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






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






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






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