Profile

Cover photo
Manav Leslie
Works at Pearson Technology Group
Attended Kendriya Vidyalaya
Lives in London
210,445 views
AboutPosts

Stream

Manav Leslie

Shared publicly  - 
 
As commented by someone in Gizmodo - "a life time of work validated in 2 seconds. I wouldn't know how to feel but man it must be amazing"  Stanford Professor Andrei Linde celebrates physics breakthrough
1
Add a comment...
 
http://goo.gl/jdmfET AAP's take on why congress and bjp are each other's B team. Desh pain mein aur woh spain mein :) Some interesting times ahead for Indian politics. 
1
Add a comment...

Manav Leslie

Shared publicly  - 
 
Singhal .. Amit choon http://youtu.be/roVZrT2_xuc  
1
Add a comment...

Manav Leslie

Shared publicly  - 
 
Simplest explanation history of life on earth 
5
1
Thomas Kakkatil's profile photo
Add a comment...

Manav Leslie

Shared publicly  - 
 
 
It takes a second, but when you get it....
1
Add a comment...

Manav Leslie

Shared publicly  - 
 
How the great housing societies are built in Gurgaon .. DLF with the help of "lucky" politicians like Vadra DLF's Great Indian Housing Scam 
1
Add a comment...
 
 
Destiny

The evolution of a star depends mainly upon its mass.  There are other factors such as metallicity that can affect a star’s evolution, but the main factor is mass.  It is the mass of a star that determines its destiny.  You can see these various destinies in the figure below (http://goo.gl/QnY8P).

Although our Sun is often portrayed as a relatively small star, it is more massive than about 90% of the stars in our galaxy.  A sun-like star fuses hydrogen in its core for about 10 billion years, before becoming a red giant.  It then settles down to a white dwarf star.  White dwarfs that have close binary stars can capture matter from its companion to become a supernova, but our Sun will not take that path. 

The vast majority of stars (about 76%) are red dwarf stars.  They fuse hydrogen slowly and for a long time.  The smaller of these can fuse hydrogen for more than a trillion years before becoming a white dwarf.  

Stars larger than our Sun live brighter, shorter lives.  The largest fuse elements for only about 10 million years before they end as a supernova, or even hypernova.  The cores of some of these become black holes, but their outer layers are strewn out into the universe where material from lots of supernovae eventually collapse into stellar nurseries.

Since the evolution of a particular star depends upon its mass, the evolution of a galaxy or star cluster depends upon the mass distribution of the first stars formed in a galaxy or cluster.  This is known as the initial mass function.  In yesterday’s post (http://goo.gl/CMSuGx) I wrote about how meteroids have a power-law size distribution.  For example, you might have twenty 10-meter meteoroids for every 100-meter one, and four hundred 1-meter ones.  Stellar masses also follow a power-law size distribution.  

It has traditionally been thought that the initial mass function for galaxies is about the same for all galaxies.  In astronomer-speak, we typically say the initial mass function is universal.  But a paper in Nature last year (paywalled, but the arxiv version is here http://goo.gl/beZhFR) showed that there is some variation between galaxies.  It seems the interaction between regular matter and dark matter makes the initial mass function critically dependent on a galaxy’s formation history.

So it seems the destiny of a star also depends upon the history of its home galaxy.
1
Add a comment...

Manav Leslie

Shared publicly  - 
 
Article 51-A(h) of the Indian Constitution says: “It shall be the duty of every citizen of India to develop the scientific temper, humanism and the spirit of inquiry and reform.”       http://www.frontline.in/cover-story/suspension-of-disbelief/article5128087.ece?homepage=true#test 
1
1
Thomas Kakkatil's profile photo
Add a comment...
People
Work
Employment
  • Pearson Technology Group
    2011 - present
Places
Map of the places this user has livedMap of the places this user has livedMap of the places this user has lived
Currently
London
Previously
Chennai - Mumbai - San Francisco - Casablanca - Gangtok
Links
Story
Tagline
If you think education is expensive, try ignorance.
Education
  • Kendriya Vidyalaya
    1982 - 1994
  • National Institutes of Technology
    Electronics, 1994 - 1998
Basic Information
Gender
Male