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 group of about 30 galaxies that includes the Milky Way






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






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






4. A telescope that uses a curved mirror to collect and focus light






5. An elongated circle - or oval shape - the shape of the planets orbit






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






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






8. 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.






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






10. Chunk of rock or dust in space






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






12. Radiation left over from the beginning of the universe






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






14. An elongated circle - or oval shape - the shape of the planets orbit






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






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






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






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






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






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






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






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






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






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

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






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






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






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






29. A rapidly spinning neutron star that produces radio waves






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






31. 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.






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






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






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






35. A faint star of enormous density






36. All of the frequencies or wavelengths of electromagnetic radiation






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






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






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






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






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






42. The rainbow effect when light is dispersed through lens






43. Influenced by Copernicus; Built observatory and collected data on the locations of stars and planets for over 20 years






44. The brightness of a star when viewed from Earth






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






46. A graph relating the temperature and brightness of stars






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






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






49. Change in the apparent frequency of a wave as observer and source move toward or away from each other






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