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

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2. Chunk of rock or dust in space






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






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






5. The brightness of a star when viewed from Earth






6. Chunk of rock or dust in space






7. The two days of the year on which neither hemisphere is tilted toward or away from the sun






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






9. The study of the universe






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






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






12. The luminous cloud of particles surrounding the frozen nucleus of a comet






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






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






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






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






17. The brightness of a star when viewed from Earth






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






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






20. 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






21. 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






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






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






24. A graph relating the temperature and brightness of stars






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






26. Massive clouds of dust and gases where stars are born






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






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






29. 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






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






31. A faint star of enormous density






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






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






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






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






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






37. The study of the universe






38. All of the frequencies or wavelengths of electromagnetic radiation






39. Explained movement of planets with retrograde motion






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






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






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






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






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






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

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46. Any natural satellite of a planet






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






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






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






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