A New Theory from Scientists - Collision of Much Bigger Asteroid May Have Sparked New Life on Earth
Asteroids are small, rocky objects. Asteroids can bring tsunamis, shock waves and flattening winds that could be catastrophic. However, a car-sized asteroid (space rock) slams into the Earth’s atmosphere about once in a year. On the other hand, an asteroid large enough to threaten the existence of life on Earth arrives once every few million