NASA astronomer Michelle Thaller makes the case that quantum entanglement may be the underlying fabric from which spacetime itself emerges. 

Theoretical physicist Jim Al-Khalili explores why our sense of time may be incredibly misleading, including the idea that past, present, and future might all exist at once.

Astronomer Jill Tarter explains why SETI is really about technology, patience, and learning how to tell alien signals from our own.

Everything ever seen — every star, mountain, and face — makes up less than 5 percent of the universe. Astrophysicist Janna Levin reminds us that the rest — dark matter and dark energy — is invisible, mysterious, and everywhere. We are the luminous exception in a universe of darkness.

“Deep down the natural endpoint of this whole goal of looking for planets is to answer the question: are we alone?”

“I like to say that physics is hard because physics is easy, by which I mean we actually think about physics as students.”

“Could black holes be the key to a quantum theory of gravity, a deeper theory of how reality, of how space and time works?”

"We've sent out one or two little messages, but we certainly aren't investing billions of dollars shouting out into the cosmos saying, "Hey, we are here. Come say hi.""

"It's a very, very beautiful calculation, but it's the best example I know of the relationship between these rather abstract quantities perhaps and something that you can look at in a telescope."

“We don't have enough knowledge to precisely calculate what is going to happen, and so we assign probabilities to it, which reflects our ignorance of the situation.”

"We are all in orbit around the center of the Milky Way galaxy. How big is this collection of stars? Somewhere between 200 and 400 billion suns in the Milky Way galaxy, about 100,000 light years across."

"Asking the question of, "Where did the entire universe come from?" is no longer a question for poets and theologians and philosophers. This is a question for scientists, and we have some amazing scientific answers to this question."

"Many astronomers are really driven by the search for Earth twins because I think deep down the natural endpoint of this whole goal of looking for planets is to answer the question, are we alone?"

"Asking the question of, where did the entire universe come from, is no longer a question for poets and theologians and philosophers. This is a question for scientists, and we have some amazing scientific answers to this question that have defied even the wildest of our expectations."

From nothing to everything: How zero changed our understanding of the universe, forever.

What drives the universe's expansion? Chemist Lee Cronin explains the theories linking time, space, and selection, providing a fresh perspective on this cosmic mystery.

“We could be wrong. But if we are right, it’s profoundly important.” Leading mineralogist Dr. Robert Hazen on the missing law of nature that could explain why life emerges.

Humanity has two giant collisions to thank for its existence, explains biologist Sean B. Carroll.

Is information intrinsic in our universe? NASA’s Michelle Thaller explains.

Kmele talked with a planetary scientist, a physicist, and a futurist, to understand how visionaries across disciplines are thinking about the future of our planet and humankind.

Our host Kmele went inside Fermilab, America’s premiere particle accelerator facility, to find out how the smallest particles in the universe can teach us about its biggest mysteries.

When black holes disappear, what happens to the stuff that fell in? Physicist Brian Cox explains.

A physicist discusses the boundaries of reality and experimentation.

Quantum wormholes are mathematically possible — but might also be physically impossible. Physicist Janna Levin explains Hawking’s famous information paradox.

Gravity defies quantum mechanics. What does that mean for a theory of everything?

Ever wonder what would happen if we got sucked into a black hole? Turns out we could live in it for a while — if it was big enough.

Why does time move forward but not backward? Physicist Sabine Hossenfelder explains.

Left–Right, Back–Forth, Up–Down. What’s the fourth dimension?

How the Big Bang gave us time, explained by theoretical physicist.

Everything you ever wanted to know about the Universe, explained by physicist Sean Carroll.