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






2. All of the frequencies or wavelengths of electromagnetic radiation






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






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






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






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






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






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

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






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






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






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






13. Radiation left over from the beginning of the universe






14. The study of the universe






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






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






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






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






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






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






21. A rapidly spinning neutron star that produces radio waves






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






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






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

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






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






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






28. Chunk of rock or dust in space






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






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






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






32. The rainbow effect when light is dispersed through lens






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






34. A graph relating the temperature and brightness of stars






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






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






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






38. A faint star of enormous density






39. The brightness of a star when viewed from Earth






40. Italian astronomer - mathematician - and physicist. His telescopes proved the sun is the center of the solar system and that the planets/moon move. He was persecuted for supporting Copernicus' ideas.






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






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






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






44. Chunk of rock or dust in space






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






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






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






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






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

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