By radiation. You know, like every other satellite does.

They will not be, or need not be, in orbits with substantial amounts of shadowed time.

Most satellites aren't intended to produce thousands of watts of heat.

	▲	pfdietz an hour ago \| parent [-]
		So now we're quibbling over numbers, not saying the problem is impossible. These satellite will need larger radiators. It's an issue satellite designers have long dealt with, so the presumption that SpaceX has somehow missed the issue in their new design is not credible.