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






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






4. Plate tectonics due to thickness of crust and maintain their general form when they collide-where most volcanoes are.






5. An object that may remain after a star explodes






6. Sulfurous volcanoes - pools of liquid sulfur - surface resembles cheese pizza ACTIVE SURFACE






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






8. A spherical shell of comets that orbit the sun at a great distance (roughly two light years from the sun)






9. Venus






10. Saturn






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






12. Relativity predicts that nothing can travel faster than the speed of light in a vacuum - How can it move slower?






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






14. The trapping of heat by carbon dioxide or other gases in the Earth's atmosphere.






15. Mercury






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






17. The distance light travels in one year (=9.46x10^12km).






18. Stars orvits do not define the spiral patterns - instead they are density waves that move at slower speeds (arms are defined by young O and B stars and gas clouds)






19. What Ole Roemer used to measure the speed of light in a vacuum






20. Infinitely long -> 10 cm






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






22. 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






23. 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






24. A planet that is closer to the sun than the earth






25. Clouds of low density gas often found glowing faintly on either side of an AGN.






26. The point directly overhead.






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






28. A push or a pull






29. Approximate speed of light in a vacuum






30. The dimming of starlight by intervening dust






31. The location in an H-are diagram of a star cluster - where stars have just left the main sequence. Used to estimate the cluster age.






32. The imaginary sphere centered on the Earth that hols the stars.






33. Collections of young - hot stars






34. The most mass a white dwarf can have before collapsing to a neutron star






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






36. Titan






37. The apparent magnitude a star would have if it were at a distance of 10 parsecs.






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






39. First accurately measured the speed of light in a vacuum






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






41. The process responsible for creating the arms of flocculent spiral galaxies






42. 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






43. Mercury and venus






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






45. The north-south line passing directly overhead through the zenith.






46. A star that is burning hydrogen to helium in a shell surrounding it's core






47. Where is the center of the expansion






48. The equation that describes how matter equates with energy






49. The Big Bang was not an explosion of matter into empty space - like the explosion of a bomb. Instead - it was an emergence of space and time filled with pure energy where before none of this was present. The point from which is emerged is called the






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