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






2. A rapidly spinning neutron star that produces radio waves






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






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






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






6. Chunk of rock or dust in space






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






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






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






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






11. 23.5° - the reason we have seasons

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






13. The brightness of a star when viewed from Earth






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






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






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






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






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






19. Radiation left over from the beginning of the universe






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






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






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






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






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






25. The spinning of Earth on its axis






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






27. 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






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






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






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






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






32. Remnant of a star that is so dense that nothing - not even light - can escape its gravity field






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






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






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






36. 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.






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






38. 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






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






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






41. Any natural satellite of a planet






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

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






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






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






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






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






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






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






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