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. Varying amounts of the lighted moon as seen from earth






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






4. A faint star of enormous density






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






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






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






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






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

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






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






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






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






14. 23.5° - the reason we have seasons

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15. Point of moon's orbit when it is nearest the earth






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






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






18. 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






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






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






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






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






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






24. The brightness of a star when viewed from Earth






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






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






27. 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






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






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






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






31. Chunk of rock or dust in space






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






33. A faint star of enormous density






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






35. Explained movement of planets with retrograde motion






36. The rainbow effect when light is dispersed through lens






37. Explained movement of planets with retrograde motion






38. Space object made of dust and rock particles mixed with frozen water - methane - and ammonia that forms a bright coma as it approaches the Sun






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






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






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






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






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






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






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






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






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






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






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

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