Thursday, June 21, 2007

The Sun is a variable star

All stars are variable in their energy outputs. Sometimes their outputs vary by a little, and sometimes by a lot.

The Sun is a variable star. Its output normally varies by about a tenth of a percent over several years, and it can sometimes suddenly become much brighter when a solar flare is aimed straight at the Earth.

Although we have managed to raise the amounts of greenhouse gases in the atmosphere higher than they have been in 600,000 years (which sounds like a really really bad idea to me) by burning so much gas, oil, and coal, it seems the Sun may go through one of its low-output phases over the next decade or so, and give us some breathing room... Of course, if we keep burning fossil fuels as we have been and the concentrations of greenhouse gases go up even more during this lull, the problem will just be all the worse when the Sun brightens up again...

No comments: