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 faint star of enormous density






2. A spectrum of light in which there are no gaps - so that each region blends directly into the next






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






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






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






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






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






8. A faint star of enormous density






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

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






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






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






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






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






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






16. A spectrum of light in which there are no gaps - so that each region blends directly into the next






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






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






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






20. A particle of electromagnetic radiation having zero mass and carrying a quantum of energy






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






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






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






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






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






26. The rainbow effect when light is dispersed through lens






27. A galaxy with a bulge in the middle and arms that spiral outward in a pinwheel pattern






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






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






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






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






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

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33. Explained movement of planets with retrograde motion






34. The rainbow effect when light is dispersed through lens






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






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






37. The brilliant explosion of a dying supergiant star






38. A faint star of enormous density






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






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






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






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






43. The brilliant explosion of a dying supergiant star






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






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






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






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






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






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






50. 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