“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 ...