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. Matter that reveals itself only through its gravitational attraction.






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






3. 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 _____.






4. A word meaning 'the same in all directions.'






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






6. Hydrogen and helium (mainly)






7. A measure of the seasonal shifting of a star's position against farther stars or galaxies. The closer the star - the greater is the angular distance it shifts. We use it to find distances to stars that are up to 1000 pc away.






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






9. The rock that makes up the lunar highlands






10. Where is the center of the expansion






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






12. Electromagnetic Radiation






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






14. The family of radiant energy that includes light as a subset






15. An object that may remain after a star explodes






16. The point where an inferior planet is as far away from the sun as it can be (as seen from the Earth)






17. Light-colored high-pressure bands in Jupiter's atmosphere






18. The oldest terrain on the moon






19. 1 mm 1μm






20. A large and bright but cool star.






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






22. Star speed at outer edge of galaxy should begin to diminish - but they dont so we guess that this means there is increasing force (aka dark matter)






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 telescope that uses mirrors to focus light






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






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






27. Mercury






28. Extends to a distance of 50000AU. Same objects as in the Kuiper belt-when they fall in toward the sun they become comets. Debris from comets hitting the Earths atmosphere cause meteor showers.






29. The point directly overhead.






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






31. Venus (retrograde)






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






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






34. Massive compact halo objects (MACHO) - weakly interacting massive particles (WIMPY's)






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






36. A volume of space where few - if any - galaxies are located






37. A crystalline patter found in iron meteorites






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






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






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






41. 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.






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






43. Flattened spherical distribution of old stars with some young stars too. 'hub' of Milky way - stars orbit with solid body speeds. Elongated into bar shape






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






45. The fusion process that turns three helium nuclei into a carbon nucleus






46. The Greek philosopher responsible for making the stellar magnitude scale.






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






48. A very dense - highly populated cluster of galaxies






49. A change in the wavelength of light caused by a motion between the observer and light (or wave) source (blue shift if getting closer - red shift if moving away)






50. A star that has become a red giant for the second and final time. It is burning helium to carbon in a shell surrounding the core