What is light? That is something that has plagued scientists for centuries. It behaves light a wave... and a particle... what? Is it both? In this episode of Crash Course Physics, Shini introduces to the idea of Quantum Mechanics and how...

For years, astronomers have been unable to find up to half of the baryonic matter in the universe. We may just have solved this problem.

To human eyes, the world at night is a formless canvas of grey. Many nocturnal animals, on the other hand, experience a rich and varied world, bursting with details, shapes, and colors. What is it, then, that separates moths from men?...

The Cosmic Microwave Background shows us the oldest light in the universe, but to really understand the early universe we need something even older: The Cosmic Neutrino Background.

When scientists are planning missions, they sometimes have to take into account the fact that the light from the Sun pushes on the spacecraft. But with solar sails, they can also use that pressure to propel the craft along.

In this video Paul Andersen explains how light can be treated as both a particle and a wave. Physicists use scale to determine which model to use when studying light. When the wavelength of light is equivalent to the size of the object...

Ever wonder how lightning works? Scientists are still figuring it out, but what we do know is fascinating. Learn about positive and negative lightning, red sprites, blue jets, and ball lightning in this episode of SciShow!

In this video Paul Andersen explains how the photons emitted from or absorbed by an atom or nuclei is directly related to electrons moving between energy level. Absorption and emission are a direct result of the conservation of energy....

In this video Paul Andersen explains how at the smallest level all matter is made of fundamental particles; including quarks, electron, photons and neutrinos. He explains how understanding the properties of these particles allows us to...

Hank reaches the fourth and final of the four fundamental interactions in physics: electromagnetism. In this part, he teaches us about the electrostatic force, which builds up a charge in an object and can travel in the form of an...

Are matter, mass, and time real?

Ramesh Raskar presents femto-photography, a new type of imaging so fast it visualizes the world one trillion frames per second, so detailed it shows light itself in motion. This technology may someday be used to build cameras that can...

In this video Paul Andersen explains how matter, like light, can be treated as both a particle and a wave. Louis de Broglie proposed that matter could act as a wave and described the wavelength of matter as a function of Planck's...

Standard Model of particle physics, Explained simply. The structure of matter, that is, everything you see in the universe – you, me, the earth, stars happens to be made up of some core fundamental particles...

On May 21, 2010, Japan launched the first solar sail into space. Solar sail technology uses light for spacecraft propulsion, but not in the same way that traditional solar panels do. While solar panels use light to generate electricity,...

Can two versions of reality exist at the same time? Physicists say they can — at the quantum level, that is.

Follow the adventures of those who chase the beauty of the Northern Lights, making a living from one of nature’s most breathtaking spectacles.

The photoelectric effect is a phenomenon where electrons are emitted from a material, typically a metal, when exposed to light. This effect supports the quantum theory of light and demonstrates the particle-like properties of...

This video discusses the concept of redshift and the expansion of the universe, starting with the discovery of the universe's expansion through the redshift of light from distant galaxies. It explains the three types of redshift: Doppler...

As you go faster, what happens to time and space? What would happen if you could manage to go the speed of light? Astrum Answers!

Photoelectric effect occurs when electromagnetic radiation above the threshold frequency of the given metallic surface, strikes the surface and releases electrons from it. This happens because light is made of massless particles called...

The Higgs boson is a wave, ripple or disturbance in an invisible, all-permeating field called the Higgs field. In the year 1964, Peter Higgs, François Englert and four other scientists proposed a rather unique idea to explain why certain...

Light is affected by black holes because of the theory of general relativity, which states that any massive object warps the spacetime around it. Since a photon travels by the shortest distance between two points, light appears to bend...

A chemical reaction caused by the absorption of light.
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A Twig Science
Glossary Film.
Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig Science Glossary...