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






2. Norhern lowlands- darker in color and have far fewer craters as if an ancient sea or ice field covered them. southern highlands- much higher in density of craters.






3. A point in the sky where meteors appear to come from during a shower






4. Mercury






5. A small spherical dark nebula






6. Electromagnetic Radiation






7. The oldest grouping of stars - found in the galaxy halo






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






9. Very center of galaxy. suggestion of a black hole






10. A prominence seen against the disk of the sun






11. Mercury






12. The rotation of a star or planet at different speeds at its equator and poles






13. The seasonal shifting of a nearby star's position relative to more distant objects.






14. The particle horizon is the farthest we can see. It exists because the universe had a beginning and thus a definite age. Light from distances farther away from the particle horizon have not had time to reach us yet.






15. 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






16. Form honeycomb like patterns surrounding empty or nearly empty voids.






17. The number of protons in an atom.






18. An important quality of telescopes that increases as the square of the primary mirror or objective lens






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






20. An entity that is likely in the nucleus of most - if not all - galaxies.






21. Consists of old red stars in slow orbits that plunge through disk and bulge. about 1% are old - round globular clusters.






22. Finding a star's absolute magnitude from it's placement on an HR diagram. After finding the absolute magnitude - we measure the apparent magnitude - for a distance modulus and use this to find the distance. This method is good for finding distances t






23. N=are*Fp(Ne)(Fl)(Fi)(Fc)(L) N: number of civilizations possible to communicate with are*: rate solar-like stars are created Fp: fraction of stars with planets Ne: number of planets like ours Fl: fraction of planets with life Fi: intelligent life Fc:






24. Poitns of gravitational stability in the orbit of a planet






25. The projection of the Earth's equator onto the celestial sphere.






26. The oldest part of the Milky Way






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






28. An evolved star - past the helium flash that is burning helium to carbon in it's cores






29. A large - irregularly shaped rocky object orbiting the sun mostly between mars and jupiter. Left-over planetesimals






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






31. When massive objects bend space and time enough to create multiple images of an object located behind them






32. When the Moon entirely blocks the Sun.






33. The point in its orbit where a planet is nearest the sun






34. The displacement of spectral lines to redder colors caused by the expansion of the universe.






35. The normal eastward movement of a planet against the background of hte distant stars.






36. A point in the sky where meteors appear to come from during a shower






37. If stars have diff orbital periods - than any arms formed by stars will wind into a tight spiral pattern (billion yrs or so)






38. When particles are compressed to an unnatural state where their pressure is not related to their temperature






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






40. A push or a pull






41. As open clusters age - they push gas away but dust remains this can reflect light giving the cluster a blue-ish color. also called reflection nebula






42. Sudden blasts of gamma radiation from a very distant galaxy caused possibly by a supernova explosion.






43. Then the Sun moves from north to south across the celestial equator (about September 23)






44. Flat disk with gas - dust - H2 regions - molecular clouds - dust young stars and remnants of old planetary nebula and supernova remnants. stars spin together with similar velocities called differential rotation






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






46. A term referring to the orbital character of stars near the Sun






47. After stars form they pump light energy into surrounding gas causing it to heat up and glow (H2=ionized hydrogen - H1= neutral hydrogen in molcular couds)






48. The rotation of a star or planet at different speeds at its equator and poles






49. The science of measuring light energy by wavelength.






50. All possible types of energy that can be emitted and absorbed by atoms.