His inspiration for "The Afterlife Project" came in conversation with an astrophysicist who calculated a plausible path for time travel.

But researchers disagree on exactly how old they are. Work from two decades ago suggested the rocks could be 4.3 billion years old, placing them in the earliest period of Earth’s history.

But researchers disagree on exactly how old they are. Work from two decades ago suggested the rocks could be 4.3 billion years old, placing them in the earliest period of Earth’s history.

Scientists say they have identified Earth’s oldest rocks. It could reveal an unknown chapter in our planet’s history ...

Scientists agreed the rocky outcrops in a remote part of Quebec, Canada, were ancient. But were they really Earth’s oldest? New research suggests they are.

Scientists have identified what could be the oldest rocks on Earth from a rock formation in Canada.

NEW YORK — Scientists have identified what could be the oldest rocks on Earth from a rock formation in Canada.

Studying rocks from Earth's earliest history could give a glimpse into how the planet may have looked — how its roiling magma oceans gave way to tectonic plates — and even how life got started.

Samples from a new site place the rocks at approximately 4.16 billion years old, in the earliest period of Earth's history.

Samples from a new site place the rocks at approximately 4.16 billion years old, in the earliest period of Earth's history.