Topic: sun

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Sunlight is way older than you think – TED Ed

The random walk problem -- the "mathematical formalization of a path that consists of a succession of random steps" -- can be applied to sunlight... not the sunlight that travels from the sun to Earth, which takes onl...

Space X’s Falcon 9 falls back to Earth to The Blue Danube

To the tune of Johann Strauss II's Blue Danube waltz, Space X's Falcon 9 falls majestically back to Earth in real time. Falcon 9 is a two-stage rocket that transports satellites into orbit, and powers the Dragon space...

MinutePhysics: How Big Is The Sun?

Even though the sun and the moon look around the same size in the sky, the sun is 400 times bigger than our planet's moon and is 400 times farther away. Compare the sun's 150,000,000 km (93,205,679-ish miles) distance...

Stunning Views of Earth From the International Space Station

The Blue Marble... The Pale Blue Dot... that magnificent Overview Effect... This is what our astronauts experience from the International Space Station, and what we get to see via videos like this, and this, and this,...

What is a Blood Moon? Time lapse (& real time) of a lunar eclipse

During a total lunar eclipse, the Earth's shadow falls upon on a full moon. The sun's light is blocked, turning the moon red. This is called a Blood Moon, and the next one will occur on April 4th, 2015 at 4:58am PST, ...

The science of solar eclipses: How do solar & lunar eclipses work?

How do solar & lunar eclipses work? And why don't we get eclipses every month? This Vox explainer is packed full of really interesting information about the remarkable science of solar eclipses. Find out how 5.1 d...

Solar Eclipse 2015: BBC Stargazing Live Video

From the BBC's astronomy series Stargazing Live with Professor Brian Cox and Dara O'Briain, with Liz Bonnin narrating the process, watch the March 20th solar eclipse, when the moon passes between the Earth and the sun...

Crash Course Kids: Gotta Eat! and Feed Me: Classifying Organisms

Why do we eat and how does what we eat help classify what we are? In these first two episodes from Crash Course Kids, Sabrina Cruz explains why all living things eat. Also, try the simple energy source experiment in ...

“Sunflower Cat Window” – Eight cats in a time lapse sunbeam

Ladies and gentlemen, boys and girls, keep a closer eye on your cats because they just may have an agenda that you haven't noticed before. This time lapse video by Mitsuru Yasui is an illuminating mini-epic that revea...

A Briefer History of Time: How tech changes us in unexpected ways

Have you ever gone camping where you wake and sleep with the sun and moon? Have you played outside all morning, only coming in when you get hungry for lunch? What was life like before we could measure time? How have c...

NASA’s Solar Dynamics Observatory (SDO): Year 5

From massive solar flares, to filaments and prominences, to huge sunspots, to Venus passing by, this NASA Solar Dynamics Observatory (SDO) anniversary video is a greatest hits of the star's spectacular displays from t...

Mars Loops the Loop: What is retrograde motion?

What is retrograde motion and why does a planet like Mars appear to change directions in the night sky? Is it playfully looping about in its orbit around the sun or is something less strange going on? From episode 2 o...

The sun, our closest star, in a stunning 4K time lapse animation

Compiling 17,000 images captured by the Solar Dynamics Observatory (SDO), via Helioviewer, from October 14-30, 2014, James Tyrwhitt-Drake created a stunning 4K time lapse animation. Watch 16 of our days rotate by in a...

Minute Physics: Why Is The Sun Yellow and The Sky Blue?

Why is the sun yellow and the sky blue? Why can we see the stars at night? Why is space black? And why is the sky more red, orange, and even pink at sunset? In this Minute Physics episode, we leap into "the grand ball...

Why do leaves change color?

The arrival of autumn is a great reason to talk about chemistry: When tree leaves change from green to reds, oranges, yellows, and browns, we're seeing the tree's green chlorophyll fade away, revealing hidden autumnal...

First Evidence for Water Ice Clouds Found Outside Solar System

Take a (peacefully quiet) tour through and beyond our solar system to visit a neighboring brown dwarf -- a sort of failed star that's too large to be called a planet -- called W0855. A team of scientists, led by Carne...

Fourth graders create a solar powered classroom

When Aaron Sebens started talking about renewable energy with his fourth grade class, they kept coming back to their excitement about solar power and making it a more hands-on learning experience. How might they move ...

How the Sun Sees You: Revealing human skin in ultraviolet light

Artist Thomas Leveritt set up a ultraviolet camera and viewing monitor in Brooklyn's Prospect Park to show people what their skin looks like in ultraviolet light. This is "how the sun sees you." The revealed freckles ...

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