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 telescope that uses a curved mirror to collect and focus light






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






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






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






5. Chunk of rock or dust in space






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






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






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






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






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






11. A faint star of enormous density






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






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






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






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






16. Chunk of rock or dust in space






17. 23.5° - the reason we have seasons

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18. 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






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






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






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






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






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






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






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






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






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

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






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






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






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






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






33. The brilliant explosion of a dying supergiant star






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






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






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






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






38. The study of the universe






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






40. 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






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






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






43. 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






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






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






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






47. Any natural satellite of a planet






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






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






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