Link to The universe: (S3) 6- Deadly comets and meteors documentary
Documentary Description
At this very moment, celestial forces prowl the Universe and threaten
man's very existence. They're asteroids and comets--and they've left
their imprint on planet Earth, literally. Initially, they helped build
planets through violent collisions. During this fiery bombardment
period, they may have even seeded Earth with water and the building
blocks for life. Since the turbulent formation of the solar system,
these space rocks have continued to impact earth. Some have been so
violent that they've led to mass extinctions events, including one that
wiped out the dinosaur. What's more, radical new theories suggest that
asteroid and comet dust harbor deadly viruses that may have triggered
some of our worst pandemics. The possibility of future cosmic
collisions remains a legitimate threat. Yet, despite their dangers,
asteroids and comets may hold vital natural resources, which could
actually preserve mankind.
