Transsphenoidal approach

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Jul 6

rhamphotheca:

Chemistry and the Universe

Chemistry, the study of the intricate dances and bondings of low-energy electrons to form the molecules that make up the world we live in, may seem far removed from the thermonuclear heat in the interiors of stars and the awesome power of supernovas. Yet, there is a fundamental connection between them.

To illustrate this connection, the familiar periodic table of elements—found in virtually every chemistry class—has been adapted to show how astronomers see the chemical Universe. What leaps out of this table is that the simplest elements, hydrogen and helium, are far and away the most abundant.

The Universe started out with baryonic matter in its simplest form, hydrogen. In just the first 20 minutes or so after the Big Bang, about 25% of the hydrogen was converted to helium. In essence, the chemical history of the Universe can be divided into two mainphases: one lasting 20 minutes, and the rest lasting for 13.7 billion years and counting.

After that initial one third of an hour, the expanding Universe cooled below the point where nuclear fusion could operate. This meant that no evolution of matter could occur again until stars were formed a few million years later. Then the buildup of elements heavier than helium could begin…

(read more: Chandra X-Ray Observatory)

Jul 6
fohkat:

“Seeing a nuclear reactor start up is cooler than my sci-fi dreams”
Why does it glow blue? It’s the Cherenkov radiation:

Cherenkov radiation is electromagnetic radiation emitted when a charged particle (such as an electron) passes through a dielectric medium at a speed greater than the phase velocity of light in that medium.

fohkat:

Seeing a nuclear reactor start up is cooler than my sci-fi dreams

Why does it glow blue? It’s the Cherenkov radiation:

Cherenkov radiation is electromagnetic radiation emitted when a charged particle (such as an electron) passes through a dielectric medium at a speed greater than the phase velocity of light in that medium.

(Source: Seeing a nuclear reactor start up is cooler than my sci-fi dreams)

(Source: Flickr / cleo-nikita)

I must be willing to give up what I am in order to become what I will be.

- Albert Einstein (via psych-quotes)

upus:

sloppy:

the deepest post on this site

damn

upus:

sloppy:

the deepest post on this site

damn

(Source: jayreyilly)

(Source: morganjc)

One day, a long time from now you’ll cease to care anymore whom you please or what anybody has to say about you. That’s when you’ll finally produce the work you’re capable of.

- J.D. Salinger (via fourteendrawings)

Mar 2
wasbella102:

 Floating Lantern Festival, Thailand 

wasbella102:

Floating Lantern Festival, Thailand 

(Source: blossom-then-die)