Scientists theorize that Earth's oceans may have been 'delivered' by comets during massive collisions. It was comets and not asteroids because of specific amounts of iridium found in Greenland's rocks. In case you are wondering, here are the common differences between comets and asteroids:
- Comets display comas and tails due to sublimation of water and ejection of dust particles from solar radiation.
- Comets have more eliptical orbits than asteroids around the sun.
- Comets may become asteroids when they run out of watery particles.
This article is exciting because it opens up a whole new perspective on the origin of life. It is commonly believed that life first formed in bodies of water. Is it possible that comets 'delivered' life along with oceans to Earth?