Revise GCSE Physics

P2f Exploring the Solar System

  1. How fast does light travel?
  2. Does the fact that the speed of light is not infinite cause any problems?
  3. What is a light-year?
  4. Why do we use light-years instead of kilometres to describe the distance to objects in space?
  5. How many Universes are there?
  6. What are planets, stars, comets, asteroids, meteors and meteorites, galaxies and black-holes?
  7. How are these astronomical objects arranged in order of size?
  8. How many galaxies are there?
  9. What is the Earth's galaxy called?
  10. What is the Solar System?
  11. What type of astronomical body is the Sun?
  12. What type of astronomical body is the Moon?
  13. What order do the planets lie in, working outwards from the Sun?
  14. What is necessary for a planet to travel in a circular (elliptical) motion around a star?
  15. What provides the centripetal force to keep planets in a circular path?
  16. How do we know anything at all about the stars?
  17. Why do stars give off their own light?
  18. Why do we see stars as being older than they really are?
  19. What difficulties must be overcome to send a human being into space safely?
  20. How does manned space flight more difficult and expensive than unmanned spaceflight?
  21. Why are unmanned space probes sent into space?
  22. What are the disadvantages of using unmanned space probes to explore the Solar System?
  23. Aside from resources, why is it preferable to send unmanned probes into space?
  24. How far has man travelled from the Earth?
  25. Why have samples of rock from Pluto never been brought back to earth?
  26. How are the techniques used for investigating near and distant planets different?