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Contents of the Universe: Dark Matter and Dark Energy

Amazingly, 95% of the make-up of the universe is stuff we can't see, according to cosmologists. Find out more about dark energy and dark matter, which far surpasses the amount of visible mass in the universe.

Physics Spotlight10

Hilbert Space

Definition of a Hilbert space

Quantum Mechanics: The Theoretical Minimum by Leonard Susskind

In this book, theoretical physicist Leonard Susskind goes into detail on the mathematics needed to study quantum mechanics.

Bra-Ket Notation

Quantum physics uses an unusual mathematical system called bra-ket notation, which mathematically describes a wavefunction evolving over time.

Cosmos: A Spacetime Odyssey

The full 2014 series of Cosmos: A Spacetime Odyssey explores what science knows about our universe and some of the amazing figures that discovered it.

Cosmos: A Spacetime Odyssey, episode 13, Unafraid of the Dark

In the finale of Cosmos: A Spacetime Odyssey, we explore the invisible portions of our universe, filled with mysterious dark energy and dark matter.

Cosmos: A Spacetime Odyssey, episode 12, The World Set Free

Cosmos explains the science behind the greenhouse effect, on Earth and beyond, as well as the history of how we understood this phenomena.

Cosmos: A Spacetime Odyssey, episode 11, The Immortals

The Cosmos series explores the possible origins of life on Earth and whether these origins may lie beyond the boundary of our solar system.

My Brief History by Stephen Hawking - Physics Book Review

Brilliant physicist Stephen Hawking writes an autobiography detailing both his personal and scientific life.

Cosmos: A Spacetime Odyssey, episode 10, The Electric Boy

Cosmos explores the earliest discoveries of the electronic age through the life and scientific work of Michael Faraday.

Cosmos: A Spacetime Odyssey, episode 9, The Lost Worlds of Planet Earth

Dr. Tyson goes through a number of transformative phases in Earth's history, that helped lead to the development of life.

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