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. 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.






2. A push or a pull






3. Venus






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






5. Heavier elements such as iron - silicon - magnesium - sulfer - nickel






6. The movement of the Earth's crustal plates riding on top of the mantle.






7. Large nebula consisting of very cold gas and dust






8. A cloud of ionized hydrogen. Formed when young stars heat the surrounding gas






9. The source of the force that is accelerating the expansion rate of the universe.






10. An element of a highly efficient - two-dimensional electronic light detector






11. Titan






12. In an OPEN UNIVERSE - the curvature of space-time is ____ - Parallel beams will converge/diverge/remain parallel (circle one). The density parameter - Ω0 - is____.






13. 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






14. In an OPEN UNIVERSE - the curvature of space-time is ____ - Parallel beams will converge/diverge/remain parallel (circle one). The density parameter - Ω0 - is____.






15. A distance measure determined by the shifting of a star against the background sky every 6 months.






16. A force exerted by reflecting sunlight






17. The gap etween saturn's A and B rings






18. We can infer the absolute magnitude of pulsating variable stars by measuring their pulsation periods. The longer the pulsations - the greater their luminosities. We then again measure their apparent magnitudes - compare it with their absolute magnitu






19. A quantity measuring the stability of the Earth's atmosphere






20. 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






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






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






23. Venus (retrograde)






24. A younger cluster of stars - found in the galaxy disk






25. The point in its orbit where a planet is farthest from the sun






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






27. 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






28. A cool collection of gas and dust silhouetted against a brighter background of stars and/or gas






29. A cool collection of gas and dust silhouetted against a brighter background of stars and/or gas






30. The shadow area behind the Earth or Moon where the Sun is completely obscured.






31. Any change in the speed or direction of an object's motion






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






33. 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.






34. How is the Hubble Law consistent with an expanding universe?






35. The process similar to conduction by which energy moves from the solar core to the convective layer






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






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






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






39. Earth






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






41. A huge sphere of tenuous gas surrounding the nucleus of a comet






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






43. Why does the earth have few craters while the moon has many?






44. Latin for 'cloud'. A word used to describe the collections of gas and dust in the Milky Way and other galaxies






45. Light-flaky crust - convective currents cause it to wrinkle and bunch (1/5 of surface). uniform cratering suggests lack of weathering and tectonics. volcanoes are flat due to atmospheric pressure.






46. When a planet lines up with the sun inthe sky






47. Young clusters in disk are irregularly shaped since they have no time to relax into the rounder relaxed shape of globular clusters-will constantly be torn apart and assimilated.






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






49. A small and dim but hot star.






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