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. A very dense - highly populated cluster of galaxies






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






3. A collection of galaxies like the one the Milky Way belongs to






4. The law that predicts the possible types of spectra.

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5. 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.






6. Large nebula consisting of very cold gas and dust






7. The light produced when particles from the sun collide with atmospheric molecules






8. The point directly overhead.






9. The apparent path of the Sun through the stars on the celestial sphere.






10. A star that is in the process of forming. It glows from gravitational contraction






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






12. 10 nm 10^2 nm






13. A faint - remarkably uniform distribution of radiation in space






14. A rock or iron specimen that has fallen from space






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






16. Originially thought to be stars emitting radio radiation but are now concluded to be nuclei of distant galaxies (same as radio galaxies aka emit streams of material)






17. Jupiter






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






19. The state of having a balance between inflowing and outflowing heat-- the temp at every radial point is different but constant






20. 1μm 100 nm






21. An important quality of telescopes that increases as the square of the primary mirror or objective lens






22. The opaque universe that existed for 300000 years after the Big Bang. (photons outnumbered nuclei by 1 billion to one - so less light)






23. 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)






24. A small spherical dark nebula






25. The source of the force that is accelerating the expansion rate of the universe.






26. Disk dust grains are made of all the elements that are not in gaseous form in space which blocks starlight and causes interstellar extinction






27. The apparent backward motion of a planet against the background of stars.






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






29. Ganymede and Titan






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






31. Any change in the speed or direction of an object's motion






32. A cool collection of gas and dust silhouetted against a brighter background of stars and/or gas






33. The Big Bang says that the universe has not existed forever. It had a distinct beginning about 14 billion years ago called the 'Big Bang'. Therefore light from any object more than 14 billion light years away has not had time to reach us. The other p

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34. 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.






35. A method of finding a star's distance from its absolute magnitude and spectral type or color.






36. 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)






37. Large bulge - tightly wound spiral arms - relatively few h2 regions and are smooth






38. Heavier elements such as iron - silicon - magnesium - sulfer - nickel






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






40. 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






41. Mercury






42. The rock that makes up the lunar maria






43. The wavelengths where a specific element can absorb or emit light.






44. The instant of time after the Big Bang when space and time obtained their characteristics. (t=10^-43 sec when gravity freezes out-instant when gravity started existing as a separate force)






45. A planet that is farther from the sun than the Earth is






46. 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






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






48. The oldest terrain on the moon






49. What is the universe expanding into?






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