Difference between revisions of "Miscellaneous"
From PGSC Wiki
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*If we go out at a clear night, how many stars can we see with naked eyes? | *If we go out at a clear night, how many stars can we see with naked eyes? | ||
| − | *What is Vega? | + | *What is Vega, Sirius? |
| − | *What is the Cygnus loop? | + | *What is the Cygnus loop, Crab nebula? What are their angular extents? |
*How would you define "strong gravity"? | *How would you define "strong gravity"? | ||
Revision as of 16:15, 20 April 2009
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?
- What is the angular extent of Virgo?
- How big is a typical globular cluster on the sky?
- What do you know about planetary nebulae? What is their extent?
Coordinates:
- What is the mean local sidereal time at midnight on March 20th? (RS)
- What is the RA of the sun at the autumnal equinox? (RS)
Brightest objects in the sky:
- What is the brightest object in the night sky? Second? Third? (RS)
- What is the brightest star? (RS)
Other:
- If we go out at a clear night, how many stars can we see with naked eyes?
- What is Vega, Sirius?
- What is the Cygnus loop, Crab nebula? What are their angular extents?
- How would you define "strong gravity"?
- How are muons created in the atmosphere?
- What are cosmic rays? What type of particle?
