Weird Surface Tension - Sixty Symbols

Sixty Symbols regulars Roger and James are part of a team investigating surface tension in granular systems. Their new paper is published at http://prl.aps.org/abstract/PRL/v109/i22/e228002

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Dark Energy

The universe is huge and getting bigger all the time, and we have we have dark energy - the most mysterious force in the universe - to blame/thank for it. Thought to make up more than 70% of the energy in the whole universe, Hank describes how dark energy was theorized to exist, and how scientists are trying to explain it.

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Dark matter is a circus master in the universe

The expansion of the universe, the big bang and dark matter. Astronomers talk us through what we know and don't know about the universe.

 

From Kepler to Webb: The History of the Telescope

Hank regales us with the history of the telescope, and then introduces us to some folks from the team who are working on the newest telescope in the chronology - the James Webb Space Telescope, an infrared telescope due to launch in 2018. Thanks to the team at Northrop Grumman for allowing us the privilege of touring their facility, and to the scientists at NASA Goddard Space Flight Center for their help with this video.

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How Big is the Universe?

Explains how astronomers have learnt to measure the distance to the stars. How many stars are in the observable universe and is it possible to comprehend the size of it all?