Difference between revisions of "Miscellaneous"

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*How would you define "strong gravity"?
 
*How would you define "strong gravity"?
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*What do you know about planetary nebulae? What is their extent?

Revision as of 18:49, 7 November 2008

Questions that really don't belong in any category, even a new one... Scales:

  • What are the masses and radii of the following objects: electron, proton, earth, sun, solar system, globular cluster, open cluster, galaxy cluster.
  • What is the spatial extent of the visible universe?
  • If we go out at a clear night, how many stars can we see with naked eyes?
  • What is Vega?
  • What is the Cygnus loop?
  • How would you define "strong gravity"?
  • What do you know about planetary nebulae? What is their extent?