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






2. The opaque universe that existed for 300000 years after the Big Bang. (photons outnumbered nuclei by 1 billion to one - so less light)






3. Formed from slow rotating clouds - collapsed quicker - initial star formation rate is high but died out - older - little rotation - look redder






4. A very dense - highly populated cluster of galaxies






5. 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.






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






7. Large nebula consisting of very cold gas and dust






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






9. The fate of the universe if it is closed. The universe expanding as much as possible and then retracting






10. The larger bodies that formed early in teh solar nebula that were chemically differentiated






11. Cold aggregates of gas - large and contain a huge amount of matter - so cold that molecules stick together to form molecules.






12. 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.






13. Europa






14. When the Moon entirely blocks the Sun.






15. When the Sun is farthest north of the celestial equator (about June 22)






16. 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






17. Matter that reveals itself only through its gravitational attraction.






18. The final end state of a high mass star. .An entity for which gravity has completely overwhelmed all other forces of nature.






19. A star that blows itself apart






20. Ganymede and Titan






21. Mercury






22. Highlands: rocks are made of lighter anorthosite (similar to old earth rocks) Maria: rocks made of heavy mare basalt (volcanic rock) everywhere else is loose regolith created by meteoric impact.






23. Titan






24. Venus






25. 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:






26. In a FLAT UNIVERSE(our universe) - the curvature of space-time is ________. Parallel beams will converge/diverge/remain parallel (circle one). The density parameter - Ω0 - is _____.






27. The act of removing an electron from an atom.






28. A word meaning 'the same everywhere throughout.'






29. A massive variable star used to find distances to the galaxies or clusters that contain them.






30. An object that may remain after a star explodes






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






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






33. The assumption that the universe is isotropic (same in all directions) and homogeneous (Same everywhere throughout)






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






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






36. 1. We see rapid movements or high energy radiation coming at some level from the nuclei of nearly every galaxy we have looked at. 2. We suspect that the creation of these supermassive black holes is part of the galaxy formation process.






37. The elementary building blocks from which protons and neutrons are formed.






38. A highly variable galaxy nucleus of which BL Lac is one. Their light is highly energetic and their spectra are featureless. (face on)






39. 1 mm 1μm






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






41. Originially thought to be stars emitting radio radiation but are now concluded to be nuclei of distant galaxies (same as radio galaxies aka emit streams of material)






42. The opaque universe that existed for 300000 years after the Big Bang. (photons outnumbered nuclei by 1 billion to one - so less light)






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






44. The dark - relativley smooth areas on the moon; Latin for sea






45. A phenomenon seen when the Earth passes through the orbit of a burned out comet






46. A measure of the ability of a telescope to see fine detail






47. A technique using computer-controlled mirrors to sharpen images distorted by the atmosphere






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






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






50. A subatomic particle with a negative charge. It creates light.