Topic: sun

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Can you push a spacecraft with light? – Physics Girl

In this episode from Physics Girl, Dianna Cowern explains how space ships can use sunlight to travel the stars in the same way that boats use wind to move across the seas. While solar sail spacecraft design is a more ...

Evidence of a Ninth Planet

Thanks to mathematical modeling and computer simulations by CalTech researchers Konstantin Batygin and Mike Brown, we now have strong evidence that there's a large planet -- about 10x Earth's size -- orbiting in an ex...

Solar Wind Strips Martian Atmosphere – NASA Goddard

In 2014, NASA's MAVEN (Mars Atmosphere and Volatile Evolution mission) spacecraft measured the speed and direction of ions escaping from Mars. The data collected as it orbited the Red Planet is visualized in this NASA...

Lunar Eclipses Explained + Does The Moon Really Orbit The Earth?

"As bright as the moon looks in the night sky, what we're really seeing is sunlight, and the percent of its face that's illuminated depends on where it is in relation to the Earth. At the point in its orbit when the m...

What is a constellation? – Crash Course Kids

A constellation is a cluster of stars that create an imaginary shape... a celestial connect-the-dots. In a sky full of millions of stars, these connections between the brightest objects helps astronomers, storytellers...

Building the solar system to scale in the Nevada desert

"Every single picture of the solar system that we ever encounter is not to scale. If you put the orbits to scale on a piece of paper, the planets become microscopic and you won't be able to see them. There is literall...

Supermoon ‘Blood Moon’ Lunar Eclipse – NASA

On September 27th, 2015, a supermoon lunar eclipse -- that's a supermoon and a lunar eclipse or 'blood moon' happening at the same time -- will be visible around much of the planet in a rare celestial event. How rare?...

Stanford Solar Car Project: Racing on Sunshine, a documentary

In 2013, the Stanford Solar Car Project student-run team raced Luminos across the Australian outback, 1,864 miles (3,000 km) from Darwin to Adelaide, in the Bridgestone World Solar Challenge. The trailer above gives j...

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...

How Big Is The Sun? – MinutePhysics

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,...

Lunar eclipse – Time lapse and real time videos

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...

Gotta Eat! and Classifying Organisms – Crash Course Kids

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...

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