What Does Dark Energy Look Like?
Season 45
About the Episode
The mysterious substance ripping our universe apart.
Aired:
| Expires: | Runtime: 4m 16s
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Extras
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Egypt's Tombs of Amun Preview
A long lost ancient cemetery opens the door to a unique period in Egyptian history.0:30 -
What You’re Probably Seeing If You Spot a UFO
Our skies are full of objects, natural and manmade, that are not as strange as you might think.2:17 -
What Happens to Your Checked Bag at the Airport?
Getting the right bag to the right plane requires an ingenious system. Here’s how it works.2:34 -
Area 51: UFO Sightings and an Infamous Government Cover-Up
Area 51’s UFO myths became a cover for secret testing of cutting-edge military technology.2:35 -
Is the Government Hiding Information on UFOs?
What does the government know about UFOs? Experts weigh in on the need to identify these objects.1:03 -
The Physics of Breaking, a New Olympic Sport
Here are three moves in breaking, the newest Olympic sport, that appear to defy the laws of physics.1:19 -
Who is the Mystery Man Buried Under Notre Dame?
Can scientists identify the man buried inside a mysterious coffin found under Notre Dame?3:00 -
Dino Birds Preview
Fossils reveal how birds survived the killer asteroid and became today’s only living dinosaurs.0:29 -
Extreme Airport Engineering Preview
Follow the race to build a world-class airport on the site of one of America’s busiest flying hubs.0:30 -
