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"Earth has a volume of about one trillion cubic kilometers. Can you picture a cube 1,000 meters high, 1,000 meters deep, 1,000 meters across? Now picture a trillion of them.”

It “has a mass of 6,000,000,000,000,000,000,000,000 kilograms, or, if you prefer, 6 sextillion tons. In pounds, that’s actually … 0. Nothing. Mass is a measure of how much stuff an object contains, but weight is how hard gravity pulls on that mass. The Earth is in space, orbiting the Sun, so it’s in free fall. It has mass, but no weight at all.”

"There is no physical place where Earth’s atmosphere stops and space begins; the air just gets thinner and thinner and eventually fades away. But we love definitions, so the official height above the Earth’s surface considered to be where space begins—called the Kármán line—is at an altitude of 100 km. Anyone who gets higher than that is considered an astronaut.”

"It’s about 71 percent water by area, dominated by the Pacific Ocean, which covers a staggering 155.6 million square km (60 million square miles) of the surface. That’s nearly a third of the planet.”

But, “if you took all the water on Earth and collected it into a single drop, it would be just less than 1,400 kilometers (860 miles) across.”

"Earth is warming up. It’s a fact. Deal with it.”

Earth Day Fun Facts | Slate | NASA

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