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Recent Podcast
A Tour of SDSS J103842.59+484917.7
A Tour of SDSS J103842.59+484917.7
One hundred years ago this month, Albert Einstein published his theory of general relativity, one of the most important scientific achievements in the last century. (2015-11-24)

Video Podcasts: The Incredible Two-Inch Universe

Step 2: The Realm of Our Sun the Only Star in Our Solar System

Now let's switch scales by shrinking the minivan-sized Sun down to a 2-inch diameter:
  • Earth Size - A grain of salt, with a dust-speck Moon 1/2 inch away from it
  • Sun-Earth Distance - 20 feet (5.5 m) - or 10 paces away
  • Pluto's Orbit - 2.5 soccer fields away from the 2-inch Sun
  • Nearest Star to Sun - 900 miles away (1500 km)
  • Light Travel Time - It takes 8 minutes for a beam of light to travel from the Sun to the Earth.
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