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When a perfect triangle is found in the middle of a unpopulated portion of Australia, experts begin to wonder whether or not the design is man made.
03:57
What on Earth?
Strange Australian Triangle
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Satellite photos show a strange circle beneath the ice of an ancient lake. Further analysis shows that these mysterious rings appear each year. What are they?
03:58
What on Earth?
Intriguing Ice Circle
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A satellite captures an image that uncovers the entrance to an underground complex. What is being built there?
04:32
What on Earth?
Chinese Underground Lair
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Scientists are baffled when a seemingly huge tsunami headed straight for Hong Kong suddenly disappears in the water.
04:02
What on Earth?
Huge Tsunami or Marine Weapon?
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Sandy Island seems to have disappeared, and scientists aren't quite sure why. Was there some sort of elaborate government experiment?
01:13
What on Earth?
Missing Island
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Satellite images capture a distinct glowing object beneath the ocean's surface.
03:18
What on Earth?
Mysterious Underwater Glow
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Satellite images reveal a strange hole in Antarctica. After scientists rule out whirlpools and sinkholes, they have to look back in time to find the answer.
02:55
What on Earth?
Ghost Lakes in Antarctica
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A commercial satellite imager spots something strange in the middle of a vast desert. It looks like an airport runway, but there are no planes. No government claims ownership of this strange place.
03:01
What on Earth?
Secret Drone Hangar Discovered in Saudi Arabia
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Satellite images reveal enormous spirals in Peru. Some researchers say they are too perfect and too huge to be man made.
00:45
What on Earth?
Strange Spirals in Peru
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Ghost lakes have existed for millions of years, but they just recently started showing themselves. Geophysicist Helen Fricker explains how scientists are moving forward with this discovery.
01:26
What on Earth?
Discovering Ghost Lakes
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For years the hottest place on Earth ever recorded was a city in Libya. When researchers took a second look at this information, they realized the measurement was wrong.
01:27
What on Earth?
The Hottest Place on Earth
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When you think of deserts, you don't typically think of bright, jewel tones. Why are these massive pools of color here?
02:04
What on Earth?
Why is this Desert so Colorful?
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Who drew this over 2 mile long humanoid figure into the Australian terrain?
02:12
What on Earth?
This Humanoid Drawing can be Seen From Space
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Satellite images revealed hundreds of black holes in the middle of the desert near ancient burial grounds. Is grave robbing still a thing in modern day or were these holes caused by something else?
00:46
What on Earth?
Black Holes in Egypt
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Satellites spotted a strange, long streak across the desert in Bolivia. At first, scientists thought it may be a skid mark from a meteor.
02:09
What on Earth?
Train Graveyard in Bolivia
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This isn’t an optical illusion. This lake on Middle Island is actually pink! You can thank the algae in the lake for the gorgeous color.
03:12
What on Earth?
This Lake is Bright Pink
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Investigators uncover an ancient forge from the dark ages.
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A Cumbrian Conundrum
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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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Alien Encounters
Do Billions of Planets Mean More Earths?
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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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Alien Encounters
The Effects of Space Trash Can Be Devastating... and Deadly
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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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Alien Encounters
Frank Drake and Nick Sagan Meet Again
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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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Alien Encounters
Nick Sagan & Frank Drake Reunite
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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?
01:35
Alien Encounters
Humanity's Evolutionary Outcome
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It's likely that an advanced civilization would combine the advantages of a machine with the advantages of biological systems.
03:08
Alien Encounters
The Hybrid
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It's possible that life on earth began off-planet and spread here.
02:42
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.
02:12
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?
03:13
Close Encounters
Strange Sighting on Canada Highway
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Reports of a downed aircraft bring a volunteer firefighter to a remote wooded area.
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Close Encounters
Mysterious Crash In Pennsylvania Woods
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The Hale - Bopp comet was overhead but a strange formation of lights in the sky didn't appear to be natural.
03:02
Close Encounters
Hale-Bopp Comet Or UFO?
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