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The Harmony That Keeps Trappist-1's 7 Earth-Size Worlds From Colliding
A visualization of the orbits of the seven planets circling the star Trappist-1.
Credit: NASA/JPL-Caltech
In February, astronomers announced the discovery of a nearby star with seven Earth-size planets, and at least some of the planets seemed to be in a zone that could provide cozy conditions for life.
From The New York Times
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