00:00What's hiding on Kepler-452b?
00:02And the answer is stranger than you'd expect.
00:05This might be the most Earth-like planet ever found.
00:08It orbits a star almost identical to our Sun.
00:11Its year is 385 days, just like ours.
00:15It sits in the habitable zone, where water could exist.
00:19From its surface, the sky would look almost exactly like Earth's.
00:23But here's what makes it haunting.
00:25This planet is 1.5 billion years older than Earth.
00:30If life ever started there, it had a massive head start.
00:33Whatever evolved could be far beyond us, or long extinct.
00:38Because there's a darker possibility.
00:40Its star is aging, growing hotter.
00:43Kepler-452b might be entering a runaway greenhouse.
00:47Its oceans, boiling away.
00:51We could be looking at Earth's future, a mirror, 1,400 light-years away.
00:57And even at the speed of our fastest spacecraft.
01:01It would take 30 million years to get there.
01:04So we may never know what's truly hiding on it.
01:07What's truly...
01:08...
01:15...ostaian
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