Escape... from a dying star.
, an advanced civilization could do exactly that — by using an entire planet as a giant spacecraft.
Nature may have already inadvertently done just that by shooting rogue planets with habitable subsurface oceans through the cosmos. Astronomers have long suspected the existence of a region enveloping the solar system called the Oort Cloud, a region enveloping our system that's suspected to be home to tiny, icy planets.
If such a planet were inhospitable or too dark, the astronomy professor suggests advanced civilizations may have already developed technologies such as fusion reactors to make them habitable.
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