Where Did Earth Get Its Oceans? Maybe It Made Them Itself

Scientists have long debated whether Earth's water came from comets or asteroids, but recent evidence suggests the planet may have generated its own water internally. After spacecraft examined comets and found their chemical signatures didn't match Earth's water, asteroids became the leading theory, though they too have limitations. Now, researchers studying exoplanets and conducting laboratory experiments have discovered that rocky planets like Earth can produce water through geological processes involving magma oceans, hydrogen, and chemical reactions.