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






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






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






4. Any natural satellite of a planet






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






6. All of the frequencies or wavelengths of electromagnetic radiation






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






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






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






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






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






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






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






14. Explained movement of planets with retrograde motion






15. Radiation left over from the beginning of the universe






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

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






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






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






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






21. A space telescope and camera named for a famous astronaut (Edward Hubble) used to study space elements






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






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






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






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






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






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






28. A faint star of enormous density






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






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






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






32. A graph relating the temperature and brightness of stars






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






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






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






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






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






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






39. A space telescope and camera named for a famous astronaut (Edward Hubble) used to study space elements






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






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






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






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






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






45. A faint star of enormous density






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






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






48. A region of the solar system that is just beyond the orbit of neptune and that contains small bodies made mostly of ice






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






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