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






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






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






4. Polish astronomer who produced a workable model of the solar system with the sun in the center (1473-1543)






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






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






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






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






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






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






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






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






13. A measure of the amount of light that a star actually emits






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






32. 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






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






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






35. 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






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






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






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






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






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






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






42. 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






43. 23.5° - the reason we have seasons

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44. The study of the universe






45. Radiation left over from the beginning of the universe






46. Explained movement of planets with retrograde motion






47. Brahe's assistant - German astronomer who first discovered the three laws of planetary motion (1571-1630)






48. The rainbow effect when light is dispersed through lens






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






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







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