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TIL part of the static seen on analog televisions is cosmic background radiation from the big bang.

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YprVv TIL Marine Iguanas have the distinct ability to "sneeze" out salt with the use of special glands they possess. This is due to the mass amount of saltwater they ingest from the ocean.
VMg7B TIL why the Apollo 11 moon landing footage is so grainy. There was a pristine version at NASA for years, but around 1980 due to a data tape shortage they reused the tape for something else.
9Xg7 TIL Saturn’s rings are younger than the dinosaurs as they were likely formed just 100 million years ago.
MeDRA TIL that the Sega Master System and Genesis are still produced under licence and being sold in Brazil, where they routinely outsell modern game consoles. This is due to high tariffs making imported consoles very expensive. Almost half of all Sega Master Systems ever sold were sold in Brazil.
XX4E TIL to find interstellar life, one of the things astronomers look out for is a Dyson Sphere, a power plant which harnesses the power of its solar system’s sun by surrounding it with solar panels. It is theorized to be a logical necessity for a spacefaring civilization to sustain intergalactic travel