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Sunday, November 28, 2010

Antimatter: Why is important?


When you want to do something, it takes energy. Where does that energy come from? From the ATOMS!! and Molecules.

The Sun, rather than use chemical energy, relies on nuclear energy! [...]
How much more efficient? If I had a million pounds of hydrogen, and I fused the entire million pounds into helium, how much would turn into energy, and how much would turn into (helium) waste? I'd get about 7,000 poundsworth of energy (which, by E=mc2, is a lot, but I'd still get 993,000 pounds of waste. 0.7% efficiency isn't so great, all things considered.
But that's where antimatter comes in. [...] if I brought a million pounds of fuel on board -- 500,000 pounds of hydrogen and 500,000 pounds of antihydrogen -- I'd get perfect efficiency: 1,000,000 pounds worth of energy and no waste.
And that's why creating and trapping neutral anti-hydrogen is such a big deal!
[...], we can store an arbitrarily large amount of it for as long as we want.

Saturday, November 27, 2010

Universo era líquido logo depois do Big Bang

Universo era líquido logo depois do Big Bang: "As primeiras colisões de núcleos de chumbo realizadas no LHC mostraram que o Universo primordial, logo depois do Big Bang, era quente, denso e tinha a viscosidade de um líquido."
Esta é uma imagem de uma colisão real de núcleos de chumbo, captada pelo experimento ALICE. Os riscos representam o caminho das partículas, os "cacos" que voam para todos os lados depois da colisão.[Imagem: Cern]

Wednesday, November 24, 2010

Aurora Borealis, Norway

Aurora Borealis timelapse HD - Tromsø 2010 from Tor Even Mathisen on Vimeo.

Thursday, November 18, 2010

Antihydrogen trapped at CERN

"Physicists working at the European Organization for Nuclear Research (CERN) in Geneva, Switzerland, have succeeded in trapping antihydrogen — the antimatter equivalent of the hydrogen atom — a milestone that could soon lead to experiments on a form of matter that disappeared mysteriously shortly after the birth of the universe 14 billion years ago.

An octupole magnet was critical to trapping antihydrogen atoms. A simple octupole magnetic field is produced by eight bar magnets in a plane with their north and south poles arrayed radially to create a magnetic minimum at the center. The antihydrogen atom is trapped in the center because of its magnetic moment, which itself is equivalent to a tiny bar magnet. The bar magnets above and below the octupole plane in this artist's rendition represent the mirror magnets that keep the atoms from squirting out the ends of the trap. (Katie Bertsche)
The first artificially produced low energy antihydrogen atoms — consisting of a positron, or antimatter electron, orbiting an antiproton nucleus — were created at CERN in 2002, but until now the atoms have struck normal matter and annihilated in a flash of gamma-rays within microseconds of creation."
image and text from

Tuesday, November 16, 2010

Baby Black Hole dicovered

Image: NASA

NASA said yesterday at a press conference that the Chandra space observatory appears to have found the youngest black hole yet found. The black hole should be a baby at the tender age of 30 years.

The Black Hole was formed after the supernova, SN 1979C. The star had a mass 20 times greater than our Sun. The supernova was detected in 1979 in the galaxy M100, which is located 50 million light years away from Earth. The Supernova actually took place some 50 million years ago, but as the light took that long to reach us, we only saw 30 years ago. So, looking for the same site now, we see what looks like a black hole young, 30 years - since we saw the supernova until today (actually, the black hole is 50 million years, but the "light "that surrounds it takes time to get to us). Look for objects in space, you see them as they were when the light left them, and not as they are "now" (When looking at the sun, for example, always see the sun as it was eight minutes before).

More in NASADiscoveryUniverse TodayDvice, e o artigo científico.
Leiam em português, na Globo, AstroPT

Robot Actress

Actress performance... but she is a ROBOT!

A life-like robot called Geminoid F has taken to the stage in Japan, but is there a chance it will it take over from the "real" performers?
Geminoid F was seated for the duration of the short play and her actions were controlled from behind-the-scenes by a human.
from BBC news

Saturday, November 13, 2010

Edublog Awards 2010 - my nominations

My Nominations for The 2010 Edublog Awards are:
Best individual tweeter: eufisica
Best individual tweeter: Cornélia Castro
Best group blog: interatic
Best Resource sharing blog: Free Technology for Teachers
Most influential blog post: X-Rays day
Best teacher blog: Carlos Portela
Best teacher blog: eufisica
Best educational use of video / visual: Carlos Portela
Best educational wiki: wikipedia
Best educational use of a social network: eufisica
Best educational use of a social network: eufisica (FB fanpages)

Thursday, November 11, 2010

First Ions Lead Collisions

Tuesday, November 09, 2010

First collisions of lead ions

First collisions of lead ions seen by the ALICE experiment on 07.11.2010 recorded by its innermost detector, the Inner Tracking System.
The shaded structures represent a perspective view of the detector elements. The lines are the reconstructed particle trajectories and the colour scale indicates the energy of the particles.

Such collisions produce an unprecedented number of particles, reaching thousands per collision.

Credits: ALICE experiment, CERN

Sunday, November 07, 2010

Fusion - From Here To Reality

An informational video from Physics World on Fusion energy and ITER.

Friday, November 05, 2010

NASA delayed Discovery's Launch

Discovery launch was delayed until the end of November.

Credit: NASA's Kennedy Space Center
An 8-inch crack has been spotted in the foam covering the intertank section of the shuttle Discovery's external tank. Engineers are assessing that situation, which has developed since the tank was drained of its supercold propellants today.
Mission Management Team prelaunch chairman Mike Moses says officials determined it just wasn't prudent to push toward a Monday launch attempt given the amount of work ahead to resolve the hydrogen leak.
Moses says the foam crack is located on the front side of the tank facing the orbiter and just above the bipod where Discovery's nose is attached. He said it's too soon to know what might need to be done with that crack.
from spaceflightnow
image credits: NASA

Discovery Launch Livestram

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Thursday, November 04, 2010



Comet Hartley 2 photo:
This close-up view of comet Hartley 2 was taken by NASA's EPOXI mission during its flyby of the comet on Nov. 4, 2010. It was captured by the spacecraft's Medium-Resolution Instrument. Image credit: NASA/JPL-Caltech/UMD
› Full image and caption
11.04.10 -- NASA's EPOXI mission successfully flew by comet Hartley 2 at about 7 a.m. PDT (10 a.m. EDT) today, and the spacecraft has begun returning images. Hartley 2 is the fifth comet nucleus visited by a spacecraft.
from NASA

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