Sun core power density compost pile

The Sun's core makes little power per cubic metre

276.5 watts per cubic metre

The Sun produces an enormous amount of energy overall, but the core's maximum is only about 276.5 watts per cubic metre, roughly comparable to the power density inside a compost pile. Fusion happens across such a vast region.

Greek cities had to work together to defeat Persia

Greek victory over the much larger Persian Empire depended on alliances between city-states. They shared resources and split military jobs among themselves in ways that no single Greek city could have managed alone.

Red Sea species moved into the Mediterranean

>1,000 Marine Species

Since the Suez Canal opened in 1869, more than 1,000 marine species from the Red Sea have moved north and settled in the Mediterranean. Some now make up a significant part of its ecosystem.

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Sun core power density compost pile

The Sun's core makes little power per cubic metre

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