Erdatmosphäre
JANET PETRO: Well, technically, space or outer space is a big void. It's a vacuum that exists beyond Earth. And even though space is a vacuum, it's not empty. Outer space contains...
A while back I told you about some rogue asteroids whose threat to Earth, while mathematically minuscule, is nonetheless real. This raises the question of what our plan is for stopping one of these...
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