Concentrated light can be incredibly powerful and useful. Learn how laser beams are produced by controlling how atoms emit photons of light. Physics - Waves - Learning Points. Lasers are photons of the same frequency going in the same...

Discover how the chemical reactions which produce the extraordinary colours of the Northern Lights have their origins in outer space. Chemistry - Atoms And Bonding - Learning Points. Aurora Borealis, or Northern Lights, is a natural...

As distinct from spontaneous emission, stimulated emission is the process in which a photon is emitted from an atom or molecule when hit by another photon of the right energy. A Twig Science Glossary Film. Key scientific terms defined in...

When light emitted from a distant object reaches another object or opening, its waves are bounced or bent slightly around the object and interfere with each other to produce various patterns on whatever they ultimately fall on. For...

The speed of light and black holes. What happens when at the speed of light? What about a black hole? This video explains how time dilations works with very fast relativistic speeds. The equation and the intuition behind the logic.

Particle physicist Nima Arkani-Hamed (Institute for Advanced Study) describes how physicists knew that the Higgs boson had to be there before any experiment.

Nobel Laureate in Physics Roger Penrose (Oxford) describes how, according to Einstein's special relativity, massive and massless particles move with respect to the light cones of space-time.

Renowned particle physicist Nima Arkani-Hamed, Institute for Advanced Study, describes how he believes that the surprisingly simple final form of a large class of complex calculations is a clue to how we can move forwards towards...

Particle physicist Nima Arkani-Hamed (Institute for Advanced Study) highlights the clues pointing us towards the need for re-addressing core issues of quantum field theory.

Students will learn about the different frequencies along the electromagnetic spectrum. Vivid animation is used to explore the visible spectrum of light and the colors it allows us to see everyday. The video also investigates various...

What is entanglement really? And why is it that its a uniquely quantum phenomena? Bohmian mechanics stuff: In Bohmian mechanics, you still have superpositions, they just mean something very different. A Bohmian mech particle only has one...

With recent high-profile security decryption cases, encryption is more important than ever. Much of your browser usage and your smartphone data is encrypted. But what does that process actually entail? And when computers get smarter and...

Heisenberg’s uncertainty principle says that if we know everything about where a particle is located, we know nothing about its momentum. Conversely, if we know everything about its momentum, then we know nothing about where the particle...

In which we discuss the amazing phenomenon of chlorophyll fluorescence.

In this video, we use the following equations to interconvert between and do calculations with Frequency (λ), Wavelength (𝝂), & Energy: 1) E=h𝝂 2) 𝝂=c/λ 3) E=hc/λ

NASA Goddard is preparing to demonstrate for the fist time in space, a 3-wavelength, laser remote sensing instrument. The Cloud-Aerosol Transport System or CATS will measure clouds and aerosols in the Earth's atmosphere. This...

Mars's thick early atmosphere was likely lost to space, and the Sun is a potential culprit. When high-energy solar photons strike the upper Martian atmosphere they can ionize gas molecules, causing the atmosphere to erode over time....

Introduction to Fluorescence

What do we know about black holes? Joe Pesce, a National Science Foundation astrophysicist, answers the question on this edition of "Ask a Scientist."

Snow is vital for Earth’s ecosystems and humans, from its temperature-regulating reflection of sunlight and insulating properties, to its life-sustaining water as it melts in the springtime. Snow provides freshwater for...

Deputy Systems Engineer Phil Luers explains how ICESat-2’s ATLAS instrument transmitter and receiver subsystems come together to calculate the timing of photons, which, in turn, measure the elevation of...

Pho, a plucky bright green photon of light, must travel from a NASA spacecraft down to Earth and back again to help complete a crucial science mission in this educational short film. The animation was created and produced by...

How unusual non-linear crystals can entangle particles of light, or photons. Thanks to non-profit edX.org for sponsoring this video. Quantum entanglement involves a special process of splitting photons into two. But it involves a process...

Photon Phriday is a weekly look at what ICESat-2 is measuring as it orbits the Earth. ICESat-2 Project Scientist Tom Neumann takes a look back at some recent passes in celebration of the first year on orbit for the mission....