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






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






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






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






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






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






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






8. Any of numerous small celestial bodies composed of rock and metal that move around the sun (mainly between the orbits of Mars and Jupiter)






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






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






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






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






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






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






15. 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






16. A rapidly spinning neutron star that produces radio waves






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






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






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






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






21. 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






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






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






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






25. 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.






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






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






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






29. The brightness of a star when viewed from Earth






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

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31. Explained movement of planets with retrograde motion






32. A graph relating the temperature and brightness of stars






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

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






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






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






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






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






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






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






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






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






43. The spinning of Earth on its axis






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






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






46. 23.5° - the reason we have seasons

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






48. Explained movement of planets with retrograde motion






49. Radiation left over from the beginning of the universe






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