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






2. The brilliant explosion of a dying supergiant star






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






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






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






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






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






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






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






10. A system of two stars that revolve around each other under their mutual gravitation






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






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






13. Stony or metallic object that is the remains of a meteoroid that has reached the earth's surface






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






15. The study of the universe






16. A very small star with low temperature - reddish in color






17. A system of two stars that revolve around each other under their mutual gravitation






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






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






20. 23.5° - the reason we have seasons

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21. A faint star of enormous density






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






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






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






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






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






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

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






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






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






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






32. 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






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






34. Explained movement of planets with retrograde motion






35. All of the frequencies or wavelengths of electromagnetic radiation






36. Point in orbit that is closest to the sun - planet moves faster






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






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






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






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






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






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






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






44. A graph relating the temperature and brightness of stars






45. The motion of a spinning body (as a top) in which it wobbles so that the axis of rotation sweeps out a cone






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






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

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48. The brightness of a star when viewed from Earth






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






50. A rapidly spinning neutron star that produces radio waves