Earth formed about 4.6 billion years ago, during the geological eon known as the Hadean. The name "Hadean" comes from the ...

The redder white dwarf, known as WDJ2147-4035, is just 90 light-years away and was found to be about 10.7 billion years old, becoming a white dwarf around 10.2 billion years ago.

Ever been late because you misread a clock? Sometimes, the "clocks" geologists use to date events can also be misread.

If you had a time machine that allowed you to cruise far into Earth’s incredible history, you’d probably want to avoid a window of time around 3.2 billion years ago.

The leading theory — known as the Giant Impact Hypothesis — is that the moon was created 4.5 billion years ago when a would-be planet the size of Mars smashed into the still-forming Earth.

But the whole planet probably transitioned to the plate tectonic system later, between 3.2 billion and 2.7 billion years ago. There's far more evidence of rocks getting recycled and pushed around ...

Three billion years ago, Earth was a lifeless husk. At least, that’s what some scientists believe. However, that lifeless husk may have found a healthy kickstart when a massive meteorite four ...

The map locates the Nuvvuagittuq Greenstone Belt in Canada, home to some of the oldest rocks on Earth. Earth formed about 4.5 billion years ago from a collapsing cloud of dust and gas, soon after ...

From 3 billion years ago to roughly 600 million years ago—right at the dawn of complex life on the planet—the Earth’s oceans would’ve been significantly more green than they are today.