65 million years ago, an asteroid bigger than Mount Everest hit the Earth wiping out the dinosaurs. Will we suffer the same fate? Phil Plait investigates.
Are we alone in the universe or is there intelligent life on other planets? And could aliens travel through space and reach Earth? Phil Plait investigates.
The death of a star can cause catastrophic planetary damage. But what happens when a dying star becomes a Supernova and is Earth at risk? Phil Plait investigates.