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Einstein explains his famous formula, E=mc².

Watch in 1080p/60fps on James's Youtube channel:

The speed of light on a cosmic scale. Credit:

Always a lot of debate on these light speed demonstrations where some say light is slow and others say space is huge. My take is: the speed of light is ridiculously slow relative to the enormity of space. That it takes 100,000 years to cross our galaxy seems like a horror story

Watch in 1080p/60fps on James's Youtube channel:

The speed of light on a cosmic scale. Credit:

Timelapse created using photographs taken from the International Space Station, courtesy of the Earth Science and Remote Sensing Unit, NASA Johnson Space Center (ISS065-E-470120-470977 ).

An aurora at sunrise seen from space.

See this image and other everyday objects under exterme magnification here:

This is what ultra-fine table salt looks like magnified 150 times with an electron microscope. Credit: Todd Simpson​/​UWO Nanofab

Read more about the image and view the full-size original here:

The most detailed image of the Orion Nebula ever from the Hubble Telescope. Credit: NASA, ESA, M. Robberto

Flying under the south pole of Jupiter, taken by NASA's Juno spacecraft.

Watch the full-size video in HD on Jonathan's Youtube here:

Octopuses change color by flexing cells in their skin called chromatophores that are filled with pigment. Read more:

Amazing octopus camoflage captured by diver Jonathan Gordon.

How razor clams burrow into the sand. Credit: Kate Taylor

This is what an erupting volcano looks like from space. Credit: NASA Johnson

The incredible 360 degree view from the top of Mount Everest on a clear day. Credit: Ben M Jones