What on Earth?
What on Earth?
What on Earth?
What on Earth?
More from this Show
Experts Investigate a mysterious formation in the Antartic ice.
02:56
What on Earth?
Antartic Glacier
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Experts investigate mysterious formations on a Mediteranian Island.
02:54
What on Earth?
Thumbprint Island
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New data from NASA satellites reveal a sunken lost continent in the Indian Ocean.
02:56
What on Earth?
The Sunken Continent
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A forbidden island points to a strange South American town that locals claim was the home of Adolf Hitler.
02:29
What on Earth?
Hunt for Hitler
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Experts investigate an eye shaped lake containing a mysterious floating island.
03:01
What on Earth?
Argentinian Floating Island
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Experts question the purpose of an artificially created island constructed by the military.
02:47
What on Earth?
Operation Delerium
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A deadly plague eats away at a Rhode Island forest.
03:00
What on Earth?
The Insect Destroyer
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At the height of the cold war, the CIA is confounded by a powerful new weapon dubbed the Caspian Sea Monster.
02:45
What on Earth?
Caspian Sea Monster
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An eerie green vortex of death swirls in the Baltic sea.
02:53
What on Earth?
Baltic Vortex of Death
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Experts investigate a river surrounded by death.
02:16
What on Earth?
River of Blood
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Experts investigate a seemingly alien lake, that may reveal secrets about Martian life.
02:54
What on Earth?
A Martian Lake in Canada
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A lightning bolt scars the Australian outback.
02:38
What on Earth?
The Legend of the Mega-Lightning Bolt
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A ghost ship appears on a California beach.
03:07
What on Earth?
Ship of Sin
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The search for Nazi treasure leads to a secret underground bunker.
03:01
What on Earth?
Search for Nazi Treasure
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A military satellite witnesses the disappearance of a Russian airliner over an ISIS danger zone.
02:59
What on Earth?
Terror in the Skies
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Investigators uncover an ancient forge from the dark ages.
03:00
What on Earth?
A Cumbrian Conundrum
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What would receiving a message from an alien civilization tell us about human evolution, and about surviving the most serious problems facing our planet?
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Since the 1960s, NASA has been keeping an eye on man-made objects in space. Here, engineers are replicating the devastating impact of space debris. 'Alien Encounters' airs Tuesdays at 10/9c.
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Author Nick Sagan hasn't seen his godfather, Frank Drake, in over 30 years. We capture their reunion - and find out how Drake became friends with Nick's famous father, Carl Sagan, in this exclusive clip.
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Since launching in 2009, the Kepler program has detected hundreds of previously unknown planets. How many of them are Earth-like, and what does that mean for the probability of intelligent life beyond our solar system?
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Do Billions of Planets Mean More Earths?
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Author Nick Sagan hasn't seen his godfather, Frank Drake, in over 30 years. We capture their reunion - and find out how Drake became friends with Nick's famous father, Carl Sagan, in this exclusive clip.
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Nick Sagan & Frank Drake Reunite
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It's likely that an advanced civilization would combine the advantages of a machine with the advantages of biological systems.
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The Hybrid
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It's possible that life on earth began off-planet and spread here.
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Alien Encounters
Panspermia
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An alien spacecraft might not rely solely on sunlight to power its trajectory. Find out what other energy technology aliens could use to travel through the universe.
01:30
Alien Encounters
Space-Powered Alien Ship
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Will ETs look like us? Will they resemble giant insects? Scientists debate how various environments could have created life forms beyond our wildest imagination.
01:49
Alien Encounters
Will Aliens Have Bodies?
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If the chirality of aliens is different than ours, it couldn't interact with us, and therefore would be non threatening.
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Alien Encounters
Sinistral Intentions
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It's 1967, the Cold War is on and there's a glowing orange light hovering over a U.S. Air Force base.
03:15
Close Encounters
Fire In the Sky Over Air Force Base
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John Smith and his cousin Billy have a mysterious encounter while driving on a remote highway in the Yukon. Was it a UFO?
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Strange Sighting on Canada Highway
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