How we reached the point where the next world war will be fought in space?
It seems like we’re approaching that stage. We now have satellites that can fire lasers — not only at space stations, but also reigning down terror upon earthly locales.
The power of these satellites is deeply disturbing. Here’s a compilation, from Astrum Extra, detailing everything these overpowered satellites can see, as well as what they can do.
Have you ever wondered how we know what the air is like on other planets? “We can study the air on other planets, moons and exoplanets by looking at them. In particular, by looking at light that bounces off or passes through their atmospheres,” says host Henry Reich. He fills in the details in this edition of minutephysics.
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Gravity holds most of our atmosphere in place, but lighter elements, such as helium and hydrogen, are able to escape, dodging into space en route to the stars. H/T MinuteEarth
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