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L1157

This young star hasn't started the nuclear fusion yet and obtains its energy still from the collapse of its birth cloud. It emits two opponent jets, each three quarters of a light-year long. Those have just recently broke through the surrounding cloud. L1157 is orbited by a disk of matter, which once could form a planetary system. It is the first star to be discovered in this state of stellar evolution.

Constellation: Cepheus
Age: 10 000 years
Distance: 800 light-years
Mass: circa 1 * Sun

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11/30/2007

     L1157
Photo: NASA/JPL-Caltech/UIUC
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