 |
|
|
|
|
 |
|
|
| |
|
4. Where do energetic particles come from? Enrico Fermi proposed a theory on how particles could be accelerated by collisions with magnetic fields in the galaxy. Here are his notes showing the calculations he did for this seminal paper. Notice the date, Dec 4 1948. I did a quick check and found it was a Saturday! He did all these calculations over the weekend! Although we now know that acceleration occurs due to collision with supernovae shocks, but the central.... |
|
|
|
|
 |
|
| |
|
|
|
|
|
| |
|
4. As Shawn mentioned yesterday, neutrinos have once again made headlines recently where the OPERA collaboration has verified their measurement using a different beam and some groups have refuted their claims (surprise!). Here are 158 papers debating this issue. 3. Phobos-Grunt, the Russian mission to bring samples from the Martian moon Phobos got into trouble just minutes after the launch. There seems to be very little chance of a recovery. 2. In other news, humans on the other side of.... |
|
|
|
|
|
|
| |
|
|
|
|
|
| |
|
Neutrinos are the most unsocial of known subatomic particles. They hardly interact with matter, and most neutrinos can pass through the entire Earth without undergoing any collision! They have a very low mass, no charge and as textbooks say, they travel with the speed of light. But do they? The new experimental results from the OPERA collaboration were posted on Arxiv recently: http://arxiv.org/abs/1109.4897 where the neutrino speed was found to exceed the speed of light by ~0.0025 %. When you.... |
|
|
|
|
|
|
| |
|
|
|
|
|
| |
|
Earlier this month, I was invited to deliver lectures at INFN (Italian Nuclear Agency) in a summer school entitled “Terrestrial atmosphere and cosmic rays” held at the LNGS campus (Gran Sasso Naional Lab) in L’Aquila, Italy. Aside from talking about the atmosphere and cosmic rays, I had a lot to talk about Astrobiology as well. It was the first occasion when I will be lecturing an audience of high-energy physicists. Although, I have given talks to such an audience, but.... |
|
|
|
|
|
|
| |
|
|
|
|
 |
|
|
 |
|
|
 |
Astrobiology Magazine Top Story |
 |
|
|
|
|
 |
|
|
|
|
 |
|
