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. When the Sun is farthest north of the celestial equator (about June 22)






2. Matter that reveals itself only through its gravitational attraction.






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






4. 100 nm 10 nm






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






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






7. 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)






8. 1μm 100 nm






9. 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






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






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






12. A massive variable star used to find distances to the galaxies or clusters that contain them.






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






14. The location of a supermassive black hole






15. That which is responsible for Jupiter's magnetic field






16. 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






17. Venus (retrograde)






18. 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)






19. 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.






20. The distance a moon can be from a planet before shattering from tidal forces






21. The point directly overhead.






22. 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.






23. The part of the Milky way that has on-going star formation






24. A star that erratically and explosively brightens and dims






25. A continuous spectrum of light missing energy at a few wave lengths.






26. Venus






27. The oldest terrain on the moon






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






29. 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






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






31. The high- temperatature outer layer of the sun






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






33. Stars fromt he Halo that have drifted into the disk. as earth zooms past them in a faster orbit they appear to be going backward very fast






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






35. The sinking of denser elements to the center of a young molten planet






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






37. 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.






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






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






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






41. In Ptolemy's geocentric solar system - the large circle on which a planet's epicycle moved around the Earth.






42. The larger bodies that formed early in teh solar nebula that were chemically differentiated






43. A change in the appearance of the sun at the edge of the solar disk






44. Formed from slow rotating clouds - collapsed quicker - initial star formation rate is high but died out - older - little rotation - look redder






45. The state of having a balance between inward and outard pressures in a gas--the inward force from gravity is balanced by the outward force from heat.






46. 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






47. The rotation of a star or planet at different speeds at its equator and poles






48. Dark areas on the sun that are cooler than the surrounding photosphere






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






50. Young clusters in disk are irregularly shaped since they have no time to relax into the rounder relaxed shape of globular clusters-will constantly be torn apart and assimilated.