Universe of Mystery

Questioning the universe; Hawking's black hole paradox explained; how to take a picture of a black hole; there may be extraterrestrial life in our solar system; three ways the universe could end.

Something massive is blocking the light coming from a star. Could it be an alien-built megastructure? Tabetha Boyajian shows how scientists search for and test hypotheses when faced with the unknown.

Is there more than one universe? Brian Greene shows how the unanswered questions of physics have led to the theory that our own universe is just one of many in the "multiverse."

A comet makes NASA wonder: Was it a chunk of debris from a new star system, evidence of alien technology or something else? Karen J. Meech shares how her team raced against the clock to find answers.

Backed by stunning illustrations, David Christian narrates a complete history of the universe, from the Big Bang to the Internet, in a riveting 18 minutes.

Featuring "How the James Webb Space Telescope will unfold the universe" by John C. Mather; "A rare galaxy that's challenging our understanding of the universe" by Burçin Mutlu-Pakdil; "Newton's three-body problem explained."

Where are all the aliens? Astronomer Stephen Webb has an explanation: we're alone in the universe. He makes a case for the beauty of our potential cosmic loneliness.

What if we could use the cold darkness of outer space to cool buildings on earth? In this mind-blowing talk, Aaswath Raman details the technology he's developing to harness "night-sky cooling".

Physicist Brian Greene explains superstring theory, the idea that minscule strands of energy vibrating in 11 dimensions create every particle and force in the universe.