cosmic explosions: seeds of life poonam chandra royal military college of canada
TRANSCRIPT
Cosmic Explosions: Seeds of Life
Poonam ChandraRoyal Military College of Canada
Universe is 14 billion years old.Our sun is 5 billion years.
Supernovae and Gamma ray burstsExplosions lasting fraction of a second to few seconds.
SN & GRB: Most powerful explosions
• Energy is 1029 times more than an atmospheric nuclear bomb explosion.
• One supernova can shine brighter than the whole galaxy consisting of 200 billion stars.
• As much energy in 1 month as Sun will emit in 5 billion years.
• Gamma ray bursts are 100 times more powerful than even supernovae.
DEATH OF MASSIVE STARS
Nuclear reactions inside a heavy star
Core Collapse
Supernovae
In our universe, roughly 1-8 supernova explodes
every second and around 1 GRB is detected everyday.
Supernovae: seeds of life
03rd Aug 2007
BIG BANG
75% HYDROGEN
25% HELIUM
HEAVY ELEMENTS????
Supernovae: seeds of life
Calcium in our bones
Oxygen we breathe
Iron, Aluminium in our cars
Nuclear reactions inside a heavy star
Our Earth is Safe…
BETELGEUSE
500 light years away
Nearest Supernova Candidate
RADIO TELESCOPES
VLA
GMRT
X-ray telescopes
XMM
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