About us   |   Ask an Astrobiologist  |   Astrobiology Magazine
Pale Blue.blog
 

Author Archives: Dimitra Atri

 
Dimitra Atri About Dimitra Atri
Dimitra is a Research Scientist at the Particle Astrophysics Group, Blue Marble Space Institute of Science. His papers can be accessed here: http://arxiv.org/a/atri_d_1 His home page is here: http://kusmos.phsx.ku.edu/~dimitra/Home.html
 
28
Nov 2011

Countdown to 11/29/11

POSTED BY: DIMITRA ATRI
 
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....
0 Comments  
Share
 
 
Dimitra Atri Posted by
Dimitra Atri
read more
 
23
Nov 2011

Countdown to 11/23/11

POSTED BY: DIMITRA ATRI
 
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....
0 Comments  
Share
 
 
Dimitra Atri Posted by
Dimitra Atri
read more
 
19
Oct 2011

Do neutrinos deserve a speeding ticket?

POSTED BY: DIMITRA ATRI
 
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....
0 Comments  
Share
 
 
Dimitra Atri Posted by
Dimitra Atri
read more
 
20
Sep 2011

Why Astrobiology?

POSTED BY: DIMITRA ATRI
 
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....
0 Comments  
Share
 
 
Dimitra Atri Posted by
Dimitra Atri
read more
 
Pale Blue.blog
 
RSS Twitter Facebook
paleblue.you posts
Characterizing the “Missing Era” of Prebiotic Evolution
by Sara Imari Walker
Posted on: 13, Apr 2012
Water flows on the surface of Mars.
by Noah Hammond
Posted on: 11, Apr 2012
Found the Higgs… now find the aliens!
by Adi Chopra
Posted on: 4, Apr 2012
View more
post on paleblue.you
  • Astrobiology Magazine Top Story
    PaleBlue.you