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 linear correlation between the rate of the expansion of the universe and distance. Says that as galaxies get farther away in space - the speed with which they recede from us increases. So we can measure the amount of recessional velocity and use






2. The seasonal shifting of a nearby star's position relative to more distant objects.






3. A repeated - periodic push or pull capable of summing into a larger push or pull






4. Elliptical orbits that come inside orbit of the Earth.






5. The entity responsible for spiral arms in grand-design spiral galaxies






6. A nearby galaxy with a quasar-like nucleus. closer but less bright than quasars-weaker






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






8. The universe is isotropic - homogeneous - and without beginning or end in time and space. If the universe is truly homogeneous then every line of sight will eventually end on a galaxy. If it has existed forever then there has been enough time for lig


9. A repeated - periodic push or pull capable of summing into a larger push or pull






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






11. The science of measuring light energy by wavelength.






12. Rich= dense crowded cores of galaxies - poor= few members and a looser organization of galaxies






13. A toroidal or donut-shaped collection of material attracted to a central body like a star or black hole. Dust around an object






14. The temp at which a substance in the vacuum of space solidifies






15. A planet orbiting about a distant star






16. A long-lived high-pressure bulge in Jupiter's southern hemisphere






17. 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.






18. What causes the zones and belts on jupiter and saturn?






19. Arcs of increased mass concentration that slow stars and gas down as they orbit through which cause the formation of stars.






20. 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.






21. Dying small mass stars lose their outer layers in a relatively gentle way - creating a round or bipolar nebula about the star (round like planets)






22. Europa






23. The telescope configuration that has the focus placed at the back of the primary mirror






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






25. The point where a superior planet is as far away from the sun as it can be (as seen from the Earth)






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






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






28. 10 nm 10^2 nm






29. The crust of a meteorite caused by its entry into Earth's atmosphere






30. 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.






31. Sc galaxies






32. The ratio of the actual density of the universe to the critical density. (actual density divided by the critical density






33. What are the three possible geometries of the universe?






34. The measure of a variable star's apparent magnitude as it brightens and dims with time






35. 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






36. Hydrogen and helium (mainly)






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






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






39. A telescope that uses lenses to focus light






40. Sa - Sb galaxies where two magnificent arms wind their way from nucleus out in a symmetrical manner.






41. A term referring to Earth-like planets






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






43. 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)






44. 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)






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






46. 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)






47. Milky way galaxy is a member - a small poor cluster-about 30 galaxies






48. The location around an atom where an electron resides.






49. 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:






50. A star fusing hydrogen to helium in it's core