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Winner of Sir Arthur Clarke Award for 'Best Written Presentation', 2005

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Sol
The closest star; powerhouse of our system
  • Diameter: 865,000 miles/1,392,000 km
  • Rotation: 25 days (equator)/ 34 days (poles)
  • Gravity (x Earth's): 27.9
  • Axial Tilt: 7.15 degrees
  • Surface Temperature: 5,500C
  • Core Temperature: 15,500,000C

The ULYSSES probe was designed to provide new data on the Sun. Here we see the heliosphere and bow shock created as our star moves through space, against the Milky Way. (Courtesy PPARC)

 Ulysses probe

A cutaway of the Sun showing its main features: flares, prominences, faculae, corona, and, internally, its immensely hot core and the convection cells which bring heat to the surface.
Billions of years into the future the Sun will expand to a bloated Red Giant, eventually gobbling up poor old Earth as it becomes a ball of molten slag . . . Red Giant

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