Earth rotates once in how much time? I don't know, 24 hours. Okay, so Earth rotates once in 23 hours and 56 minutes. That's a big difference from 24 hours. No. Okay, so now, how come our watches don't go 23 hours 56 minutes? Because we don't care how long it takes Earth to rotate. We care how long it takes the sun to return to its position. That's
These photographs were taken four days ago. Not by a satellite. Not by a probe. By four humans floating 252,756 miles from Earth. Farther than any human being has ever been. In all of history. Now look closer. This is Earthset. Our entire planet disappearing behind the Moon's horizon. Nobody had ever photographed that from that side of the Moon. Un
People say the sun is yellow. No, it's not, it's white. If the sun were yellow, think this through. If the sun were yellow, then in broad daylight snow would be yellow. But generally it's not, alright. When the sun sets, its light is heavily attenuated by dust in the atmosphere. These particles in the air scatter blue light out of the sun into the
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