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 elongated circle - or oval shape - the shape of the planets orbit






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






3. The brightness of a star when viewed from Earth






4. A rapidly spinning neutron star that produces radio waves






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






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






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






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






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






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






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






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






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






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






15. A faint star of enormous density






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






17. Explained movement of planets with retrograde motion






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






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

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






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






22. The rainbow effect when light is dispersed through lens






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






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






25. 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






26. All of the frequencies or wavelengths of electromagnetic radiation






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






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






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






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






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






32. The rainbow effect when light is dispersed through lens






33. Any natural satellite of a planet






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






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






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






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






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






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






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






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






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






43. Any of the small solid extraterrestrial bodies that hits the earth's atmosphere






44. Chunk of rock or dust in space






45. 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






46. Chunk of rock or dust in space






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






48. The study of the universe






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






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