AQA Physics 9-1 Space Physics

  1. Name the galaxy that contains Earth
    • The Milky Way
    • Image Upload 1
  2. Name the force that draws together dust and gas in a nebula
    Image Upload 2
    Gravity
  3. Name the stage in a star's lifecyle that comes before protostar
    Nebula
  4. Name the force that tries to collapse a main sequence star
    Gravity
  5. What provides the outward pressure in a main sequence star?
    Fusion reactions (of hydrogen to helium)
  6. Name the stage after the main sequence for a massive star
    Red super giant
  7. Name the stage after a red super giant
    Supernova
  8. Name the stage after red giant
    White dwarf
  9. Name the final stage in the lifecycle of the Sun
    black dwarf
  10. What do the most massive stars eventually become?
    Black hole
  11. Name the heaviest elements that can be produced in fusion reactions
    Iron
  12. How are elements heavier than iron produced?
    • In a supernova explosion
    • Image Upload 3
  13. Describe the process of nuclear fusion
    Very high temperature and pressure force together two small nuclei to produce a single larger nucleus
  14. HIGHER
    Why does the force of gravity not cause an orbiting satellite to change speed?
    Gravity acts towards the centre of the circle, perpendicular to the direction of motion. There is no component of gravity acting in the direction of motion so there is no change of speed.
  15. Name the almost circular path taken by planets as they orbit stars
    • Ellipse / elliptical
    • Image Upload 4
  16. HIGHER
    How does the speed of a planet change as it gets closer to its star?
    Increases (as gravity increases)
  17. Light from distant galaxies appears to have a longer than expected wavelength. What does this demonstrate?
    That they are moving from us.
  18. Name the effect whereby light from distant galaxies appears to have a longer than expected wavelength.
    Red shift
  19. Compare the recession speed of near and distant galaxies.
    Distant galaxies are moving away faster than nearby galaxies
  20. What does the amount of red-shift show?
    How fast a galaxy is moving away
  21. If a galaxy showed blue-shift, what would this mean?
    That the galaxy is moving towards us
  22. Name the most commonly accepted model explaining the creation of the Universe
    Big Bang
  23. What provides the best evidence for the Big Bang model?
    Red-shift
  24. Explain why the light from an object moving away appears to have a greater wavelength than it should
    • As the object is moving away, the distance between wavefronts appears to increase
    • increasesImage Upload 5
  25. Name a key feature of the Universe that scientists know little about
    • Dark energy
    • Dark mass/matter
  26. Name a piece of evidence that seems to contradict the Big Bang theory
    Observations of supernovae seem to suggest that distant galaxies are receding at an increasing rate
  27. State how distance from object affects the strength of gravity
    As distance increases, gravity decreases
Author
SilcoatesScience
ID
351104
Card Set
AQA Physics 9-1 Space Physics
Description
AQA Physics 9-1 Space Physics
Updated