There were two objects described as the oldest known stars
by European and US teams in 2007 and 2013 and according to them they were about
13.2 billion years old. Recently Australian astronomers said that they have
found the most ancient star known to human kind and it is about 13.6 billion
years old.The discovered star comprises of less iron than
expected in previous research. Stefan Keller and David Paterson were leading
this research. Stefan Keller and David Paterson are from the Australian National University. The research was distributed in the journal Nature.
This discovered star is located about six thousand light years away from
us. This star has been given a number SMSS J031300.36-670839.3 (In
short SM0313) by the star catalogues. This discovered star is actually
lies in our own Milky Way Galaxy. The Universe was created after Big
Bang or you can say Big Bang created the universe and after almost
couple of hundred million years of Big Bang this star was formed. Keller
said that the discovery of this star will help in understanding the old
star created after the Big Bang. It is located in the southern
constellation Hydrus. According to Big Bang theory, after Big Bang stars
were formed from Helium and Hydrogen particles. Fusion of Hydrogen and
Helium in the core of a star, mostly formed high elements like oxygen,
carbon and iron. Star discovered by Australian Astronomers does not have
a lot of iron. According to previous research by MIT supernovae were
massive explosions that produced a huge amount of iron.
On the bases of the amount of iron astronomers can calculate the age of a
star. Every supernova produces high elements like iron and younger
stars formed there contains high elements unlike older ones. This oldest
star contains iron millions of times less than the Sun. This star has
high amount of carbon. The supernova, responsible for this star must
have been too weak to emit iron from its core. The resulting supernova
or gas cloud must have high amount of carbon and low amount of iron and
eventually merged to form SM0313. It formed soon after the very first
stars in the universe exploded. This discovery of oldest star leads to
the new understanding of the universe, galaxies and especially the
ancient stars.
No comments:
Post a Comment