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






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






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






5. The brightness of a star when viewed from Earth






6. Explained movement of planets with retrograde motion






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






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

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






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






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






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






13. The name of our galaxy - a spiral galaxy that contains about 400 billion stars






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






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






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






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






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






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






20. A contracting cloud of gas and dust with enough mass to form a star






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

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






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






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






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






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






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






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






29. Any natural satellite of a planet






30. A contracting cloud of gas and dust with enough mass to form a star






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






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






33. All of the frequencies or wavelengths of electromagnetic radiation






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






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






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






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






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






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






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






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






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






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






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






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






46. Every object in the universe was attracted to every other object w/ a force that is directly proportional to the masses and proportional to distance between them






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






48. The brilliant explosion of a dying supergiant star






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






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







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