Killers Of The Cosmos
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Black holes were once considered only a theoretical phenomenon, but scientists now know that millions exist, and some of them have the potential to be lethal to earth.
Aliens could be lethal killers who want to invade and plunder our world; a team of experts investigate extra-terrestrial beings and their threat to human life.
More than 100 million pieces of small space debris are floating around the Earth; a collision between two of these objects in low Earth orbit could be catastrophic.
Every day Earth is bombarded by 100 tons of meteoroids from space. Most burn up in the atmosphere. Sometimes they hit, exploding with a force bigger than any nuclear bomb.
One hundred tons of rock from space hit Earth every day. Most burn up in the atmosphere, but just a single rock wipes out the dinosaurs.