“This confirms our view of how the Earth cooled and became habitable ... 1969 have been dated at a whopping 5 to 7 billion years old. According to the scientists who analyzed them, the grains ...

A 4.4 billion-year-old chunk of Earth is thought to be the oldest physical geological proof of how long our planet has been around - and how long it's been habitable. For context, Earth itself is ...

A distinctive blue and green image of Earth reveals our planet's most remarkable features. At 4.54 billion years old, our home world is a venerable object. But it was only with the arrival of the ...

Two huge masses deep within Earth may have remained stable for billions ... That stability may also mean these objects are extremely old, with origins going back at least half a billion years ...