Comets: Crash Course Astronomy #21 by thecrashcourse: Today on…

This is a brilliant series

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Comets: Crash Course Astronomy #21

by thecrashcourse:

Today on Crash Course Astronomy, Phil explains comets. Comets are chunks of ice and rock that orbit the Sun. When they get near the Sun the ice turns into gas, forming the long tail, and also releases dust that forms a different tail. We’ve visited comets up close and found them to be lumpy, with vents in the surface that release the gas as ice sublimates. Eons ago, comets (and asteroids) may have brought a lot of water to Earth – as well as the ingredients for life.

Table of Contents
Comets Are Chunks of Rock and Ice That Orbit the Sun 1:26
When They Get Near the Sun They Turn Into Gas 2:08
Comets Release Gas Via Vents As Ice Sublimates 2:15
Comets May Have Brought Water and Ingredients for Life to Earth 9:30

PBS Digital Studios: http://youtube.com/pbsdigitalstudios

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Where Does Hydrogen Come From? Hydrogen is everywhere, and many…

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Where Does Hydrogen Come From?

Hydrogen is everywhere, and many people think it’s going to be the one of the best forms of alternative energy. Where did it come from, and how abundant is it?

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By: DNews.

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LHC animation: The path of the protons This animation shows how…

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LHC animation: The path of the protons

This animation shows how the Large Hadron Collider (LHC) works.

The film begins with an aerial view of CERN near Geneva, with outlines of the accelerator complex, including the underground Large Hadron Collider (LHC), 27-km in circumference. The positions of the four largest LHC experiments, ALICE, ATLAS, CMS and LHCb are revealed before we see protons travelling around the LHC ring.

The proton source is a simple bottle of hydrogen gas. An electric field is used to strip hydrogen atoms of their electrons to yield protons. Linac 2, the first accelerator in the chain, accelerates the protons to the energy of 50 MeV. The beam is then injected into the Proton Synchrotron Booster (PSB), which accelerates the protons to 1.4 GeV, followed by the Proton Synchrotron (PS), which pushes the beam to 25 GeV. Protons are then sent to the Super Proton Synchrotron…

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Pluto Time

hogewash

PlutoTimePluto is billions of miles from the Sun. The sunlight is much weaker there, but it isn’t as dark as you might suppose. There’s a time during dawn and dusk each day when the sunlight on Earth matches that of high noon on Pluto.

The New Horizon’s project guys at NASA calls this “Pluto Time”. If you go outside at this time on a clear day, the world around you will be as dim as the surface of Pluto. NASA has posted an interactive widget that provides the approximate time based on your location.

The next Pluto Time here at stately Hoge Manor is at 8:38 this evening.

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