How do scientists know how old the Earth is?

Helium is the only truly non-renewable resource, and it's essential for things like MRI machines and nuclear reactors, but should we be worried? And, we turn air into food, so why can’t we get carbon to leave the atmosphere – or helium to stay? In this episode, Cosmos Science Jou ...  Afficher plus

Are you ready to Roomba? Since its launch, more than 40 million autonomous vacuums have made their way into people’s homes, and often – as the research reveals – into people’s hearts.See omnystudio.com/listener for privacy information. 

Today, time travel fiction is everywhere – and we understand the cosmos enough to even speculate what is and isn’t possible. But how old is the notion of travel through time? What sorts of attitudes and ideas concerning the nature of time were seemingly necessary before humans fi ...  Afficher plus

Encore episode. The surface of the Earth is constantly recycled through the motion of plate tectonics. So how do researchers study what it used to look like? Planetary scientist Roger Fu talks to host Maddie Sofia about hunting for rocks that can tell us what Earth looked like a ...  Afficher plus

Today, time travel fiction is everywhere – and we understand the cosmos enough to even speculate what is and isn’t possible. But how old is the notion of travel through time? What sorts of attitudes and ideas concerning the nature of time were seemingly necessary before humans fi ...  Afficher plus

Science commentator Laurie Winkless joins Kathryn to talk about how we measure time and a new paper which suggests melting water from polar regions could be affecting the Earth's rotation - what impact could it have? Researchers have found preserved microbes in two teeth dating b ...  Afficher plus