Test your basic knowledge |

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 planet that is farther from the sun than the Earth is






2. How did Earth come to have an oxygen rich atmosphere?






3. 1μm 100 nm






4. Dying large-mass stars lose their outer layers in a violent explosion creating large - chaotic remnants. these brighten like nova but are so much brighter and only occur ONCE PER STAR






5. A measure of how an object resists accelerating when acted upon by a force. It is proportional the amount of matter in an object






6. A planet orbiting about a distant star






7. The measure of a variable star's apparent magnitude as it brightens and dims with time






8. When the Sun moves from south to north across the celestial equator (about March 21)






9. A very distant - star-like object with huge - broad emission lines. Probably the nucleus of a distant active galaxy.






10. Population 1- similar to the sun and 2% of elements are metal - Population 2- formed before gas was metal- only a fraction of mass is metal.






11. A rock or iron specimen that has fallen from space






12. Distribution of dust (tells us disk is thin) - find distances to O&B stars and H2 regions (arms are sights of star formation and OB stars live and die at location of birth) -Milky way has four arms. Sun is in spur apart from arms.






13. The Greek philosopher responsible for making the stellar magnitude scale.






14. The oldest part of the Milky Way






15. VENUS






16. The rock that makes up the lunar maria






17. A prominence seen against the disk of the sun






18. The place in the sky that the Earth's axis points toward (can be either north or south)






19. Mercury






20. A prominence seen against the disk of the sun






21. A spectrum of light with energy at only a few wavelengths.






22. Mercury - Venus - Earth - Mars






23. Extends to a distance of 50000AU. Same objects as in the Kuiper belt-when they fall in toward the sun they become comets. Debris from comets hitting the Earths atmosphere cause meteor showers.






24. The light produced when particles from the sun collide with atmospheric molecules






25. A representation of the changes in color and brightness of an evolving protostar.






26. The equation that describes how matter equates with energy






27. Mercury






28. In what chemical form are jupiters nitrogen - carbon and oxygen?






29. The 11 or 22 period on the sun durin which sunspots increase - decrease - change polarity - increase and decrease again.






30. The mix of pure photon energy that emerged at the start of the universe.






31. The 'edge' of the universe. Light beyond this has not reached us yet.






32. The dimming of starlight by intervening dust






33. That which is responsible for Jupiter's magnetic field






34. The sinking of denser elements to the center of a young molten planet






35. The rotation period of the Earth measured relative to the Sun.






36. The point directly overhead.






37. The era when the ratio of matter to energy greatly favored matter. (verses radiation dominated universe where it was opaque. Matter is now dominated by gravity not photons)






38. Comglomerates of ice and rock that orbit the sun in highly elliptical paths






39. The wavelengths where a specific element can absorb or emit light.






40. An efficient - two-dimensional electronic light detector. Common in digital cameras - they revolutionized astronomical imaging






41. 30AU to 50Au from sun - consists of ancietn premordial objects made of frozen ice and dust-35000 objects or more that are larger than 100 km in diameter and many more smaller than this






42. Atmosphere blocks high energy wavelengths - atmosphere blurs optical radiation - atmosphere absorbs some radiation at all wavelengths even when it gets through.






43. A continuous spectrum of light missing energy at a few wave lengths.






44. The class of all objects having high energy radiation coming from their nuclei. Active Galactic Nucleus- Blazars - Quasars - Radio and Emit synchrotron radiation






45. The rotation period of the Earth measured relative to the stars.






46. A word used in astronomy to describe all elements besides hydrogen and helium






47. The amount of density needed to stop the universe from expanding and to begin the big crunch represented by Pc






48. A planet orbiting about a distant star






49. Material that shoots rapidly out into space. Flares cause Auroras






50. A faint - remarkably uniform distribution of radiation in space