Most moons we observe are tidally-locked to the planets they orbit. This means the same side of the moon faces the planet at all times. What if the earth were tidally-locked with the sun?!? That would mean that only one side of earth would face the sun’s heat and light at all times. This video […]

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There is a 1:1,000,000,000 scale (that’s one-billionth) model of our solar system along St Kilda beach in Melbourne, Australia. It’s probably the only way you’ll ever be able to tell your friends you hiked from Pluto to Mercury.

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The different densities of material that compose the earth’s surface create layers of like material.

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The short answer is 4.54 billion years old. But how do we even know that? And what happened during all those billions of years before humans evolved?

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