If Earth's history were condensed into 24 hours, life would have appeared at 4 am, land plants at 9:52 pm, dinosaur extinction at 11:41 pm, and human history would have begun at 11:58:43 pm.
Rainbows are actually circular. We don't typically see a full circle rainbow because the Earth's horizon blocks the lower part.
If the earth didn't have the moon, our days would only be 6 hours long.
Earth is the densest planet in the Solar System.
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