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






2. The first rock-sized bodies that formed in the solar nebula from dust grains






3. Extremely round - lots of liquid water - ice rafts on surface ACTIVE SURFACE






4. A logarithmically scaled value for the measured brightness of a star.






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






6. 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)






7. 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






8. The apparent path of the Sun through the stars on the celestial sphere.






9. 1-orbit aroudn the sun 2- are in hydrostatic equilibrium and 'mostly round' 3- have not cleared debris around its orbit 4- are not satellites






10. A star that erratically and explosively brightens and dims






11. Centered on the sun.






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






13. The slow wobble of the Earth on its rotation axis.






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






15. Small bulges - loosely wound - massive arms - arms have many H2 regions and look very lumpy






16. The law that syas light energy from a blackbody increases as (temperature^4)






17. Jupiter






18. Venus






19. The name for the only seriously considered theory of the universe.






20. 10 cm -> 1 mm






21. The law that describes the blackbody curve - and let to quantum mechanics.

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22. Dark - reddish - low-pressure bands in Jupiter's atmosphere






23. Sc galaxies where star formation and destruction is so rapid that supernova explosions are mainly responsible for compressing gas to create new stars.






24. The force of attraction between any two objects having mass






25. 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.






26. 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.






27. Ganymede






28. Any class of objects with a uniform luminosity used to determine distance.






29. A two-filter measure of the color - and hence temperature - of a star.






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






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






32. Small moons that maintain the shape of rings around Saturn and Uranus






33. When the Sun is farthest south of the celestial equator (About December 22)






34. 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.






35. The rate of expansion of the universe.






36. 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)






37. A high-pressure bulge in Neptune's southern hemisphere






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






39. A location on an H-are Diagram where evolving stars pulsate






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






41. The distance between a lens and its focal plane






42. A small and dim but hot star.






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






44. A collection of comets in the plane of the solar system - located beyond the orbit of Pluto






45. The average distance between the Earth and the Sun (=1.5 x10^8km)






46. Largest moon in solar system - two differenet types of terrain - darker terrain is older - NOT ACTIVE SURFACE






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






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






49. Europa






50. The lowest energy of an atom.