We found that life is more likely to survive an asteroid impact, so it's definitely still a real possibility that life on Earth could have come from Mars. Maybe we're Martians! The idea that life could have spread through the solar system or even the universe on rocks is known as the lithopanspermia hypothesis.
Dinosaurs would not have become extinct had it not been for a catastrophic asteroid strike, researchers have said, challenging the idea the animals were already in decline. About 66m years ago, during the late Cretaceous period, a huge space rock crashed into Earth, triggering a mass extinction that wiped out all dinosaurs except birds. However, some experts have argued the dinosaurs were already in decline.
Using the latest NASA data, physicists from the Olin College of Engineering found that there are 22,800 near-earth objects (NEOs) measuring 140 metres or larger. Assuming that an impact will kill one in 1,000 people, your odds of dying in a collision with a space rock are one in 156,000.
