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The new finding is challenging established theories of how planets come to be.
Life needs more than water alone. Recent discoveries suggest that plate tectonics has played a critical role in nourishing life on Earth. The findings carry major consequences for the search for life elsewhere in the universe.
Detailed images of disks swirling around young stars show the details of how solar systems come to be.
A system of seven Earth-like exoplanets appeared to be unstable. Now their orbits have been rewritten in the music of the spheres.
Searching for signs of life on faraway planets, astrobiologists must decide which telltale biosignature gases to target.
Three “extremely large telescopes” poised to begin observations within a decade could help answer some of the universe’s oldest and best-kept secrets.