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Neil deGrasse Tyson and Chuck Nice dive into cosmic puzzles:

Gas giants vs. rocky worlds — Giant planets are mostly atmosphere with a tiny dense core; heavy elements sink while lighter gases like hydrogen and helium stay only if gravity is strong enough (thanks to Maxwell–Boltzmann speeds).

Hiding from aliens — Early radio/TV broadcasts leaked into space, but today’s cable and encryption mean far less leakage. Perfect stealth would make signals indistinguishable from cosmic noise. Problem is, the Pioneer and Voyager plaques literally gave away Earth’s “return address.” @    • Are Aliens Listening To Us?