返回信息流Brown Sun Bubbling
Credit & Copyright: Robert Gendler
Explanation: Our Sun may look like all soft and fluffy, but its not. Our Sun is an extremely large ball of bubbling hot gas, mostly hydrogen gas. The above picture was taken in a specific color of light emitted by hydrogen gas called Hydrogen-alpha. Granules cover the solar photosphere（光球） surface like shag carpet, interrupted by bright regions containing dark sunspots（太阳黑子）. Visible at the left edge is a solar prominence（日珥）. Our Sun glows because it is hot, but it is not on fire. Fire is the rapid acquisition of oxygen, and there is very little oxygen on the Sun. The energy source of our Sun is the nuclear fusion（核聚变） of hydrogen into helium deep within its core. Astronomers are still working to understand, however, why so few neutrinos（中微子） are measured from the Sun's core.
from：NASA
这是一条镜像帖。来源：北邮人论坛 / astronomy / #6871同步于 2008/12/10
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一张太阳的照片
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