Earth may have had fresh, not just salty, water as soon as 600 million years after the planet formed — a mere blink of an eye in geologic time. Researchers analyzed oxygen molecules within 4 ...

Some 4.5 billion years ago, a lump of molten rock began to form in the solar system that eventually evolved into present-day Earth. David A. Roberts, an artist and computer scientist, created the ...

From their analysis, they determined that the meteorite, originally thought to have struck Earth 1.2 billion years ago, had actually struck 990 million years ago. “These microscopic crystals recorded ...