14 light years away in the constellation Lepus orbiting the low mass red

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14 light years away in the constellation Lepus
orbiting the low mass red star Gliese 229 is the
brown dwarf Gliese 229B. It has a
distance comparable to the orbit of Pluto but a
mass of 20-50 times that of Jupiter.Actually
resolved with the 60 Palomar telescope in 1995
using adaptive optics.
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Spectrum of Gliese 229B
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How much mass burned per second?
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Diffusion time for the sun
(less in center, more farther out)
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htpp//www.uni-freiburg.de/pnb/granmovtext1.html
Matter rises in the centers of the granules,
cools then falls down. Typical granule size is
1300 km. Lifetimes are 8-15 minutes. Horizontal
velocities are 1 2 km s-1. The movie is 35
minutes in the life of the sun
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The smallest loop is 3 times the size of the Earth
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More details of the solar corona are visible in
the ultraviolet. Picture from the SOHO
observatory in space
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