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 imaginary sphere centered on the Earth that hols the stars.






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






3. 1μm 100 nm






4. A streak of light in the atmosphere






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






6. Medium bulge - moderately would arms - arms have H2 regions in them and look sort of lumpy






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






8. In Ptolemy's geocentric solar system - the small circle on which a planet moved.






9. Venus (retrograde)






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






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






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






13. The rock that makes up the lunar highlands






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






15. A particle of light.






16. Jupiter - Saturn - Uranus - Neptune






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






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. 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






20. Population 1 with higher metals and contain many young stars in star clusters. Distribution of stars is everywhere in disk (arms only have 5% more stars)






21. Ganymede and Titan






22. A small round distribution of gas surrounding a dying star






23. Form honeycomb like patterns surrounding empty or nearly empty voids.






24. When material is heated and moves taking the heat energy with it






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






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






27. The faint glow of light left over from the Big Bang. cosmic microwave background are the photons that remain after the big bang that have not turned into matter.






28. 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.






29. Poitns of gravitational stability in the orbit of a planet






30. 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






31. The time when the universe cooled sufficiently for atoms to exist. radiation dominated= first 300000 years - THEN era of recombination turns into matter dominated for next.






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






33. The equation that describes how matter equates with energy






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






35. Jupiter






36. Titan






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






38. 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






39. Places in the asteroid belt - caused by resonance with Jupiter - where there are no asteroids






40. The oldest part of the Milky Way






41. Loops that trace the magnetic field as it erupts from a sunspot area and arches over to an adjacent area. They glow in the light of gas pouring out of corona and falling into photosphere.






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






43. Population 1 with higher metals and contain many young stars in star clusters. Distribution of stars is everywhere in disk (arms only have 5% more stars)






44. A crystalline patter found in iron meteorites






45. Earth






46. An entity that is likely in the nucleus of most - if not all - galaxies.






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






48. The rotation period of the Earth measured relative to the Sun.






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






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