The total solar eclipse on 21 August will be the first to pass across the whole of the U.S., from the Pacific to the Atlantic, in 99 years. While the demise of Earth is predicted to happen around seven billion years from now, when the expanding sun engulfs and destroys our planet, life forms will see the last total solar eclipse much sooner than then—around 600 million years from now. This is because the moon is slowly moving away from Earth, disrupting the intricate balance that causes the sun’s light to be blocked out.

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