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






4. The study of the universe






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






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






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






8. A faint star of enormous density






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






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






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

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12. The brightness of a star when viewed from Earth






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






14. A large cloud of dust and gas that can break apart into smaller pieces and form stars






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






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






17. Explained movement of planets with retrograde motion






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






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






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






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






22. A large cloud of dust and gas that can break apart into smaller pieces and form stars






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






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






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






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






27. The theory that states that gravity will over come the expansion of the universe and bring everything together in an implosion






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






29. The spinning of Earth on its axis






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






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






32. A graph relating the temperature and brightness of stars






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






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






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






36. A rapidly spinning neutron star that produces radio waves






37. All of the frequencies or wavelengths of electromagnetic radiation






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






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






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

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






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






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






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






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






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






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






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






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






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