Blue Sun Bristling
Our Sun may look like all soft and fluffy, but it's not. Our Sun is an extremely large ball of bubbling
hot gas, mostly hydrogen gas. The above picture of our Sun was taken last month in a specific red color
of light emitted by hydrogen gas called Hydrogen-alpha and then color inverted to appear blue. In this
light, details of the Sun's chromosphere are particularly visible, highlighting numerous thin tubes of
magnetically-confined hot gas known as spicules rising from the Sun like bristles from a shag carpet.
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 of hydrogen into
helium deep within its core.