So we just talked of possibility that escaping the earth, getting swallowed up
by the sun.And arrive somewhere else.
Then of course we need to know that there are newer
stars and newer planets maybe we can possibly live on. Fortunately, we do see
that new stars are born in a Milky Way galaxy. So what is happening there is that there is a cloud of gas, and we can actually
accumulate this gas, which is basically
made of bunch of tiny little particles made of atoms. And eventually, they
collect into a formation of a star, and
there will be a dust around it, which eventually forms rocky
planets, like the earth. So it's an
interesting subject of research these days if you can ever find extra solar planets.
For a long time, we knew of planets only inside our solar system. With
an explosion new
observations have identified candidates
of planets outside a solar system. There
are more than 2,000 candidates of extra solar planets. We
see the distribution in their masses, some of them are very
heavy, like
Jupiter, some of them are much lighter on
earth guided planets. Bigger
ones are easier
to spot. We can find the candidates
of planets, which are sort
of a similar mass as the earth happens
to be sort of the right distance
from its star.
That the temperature is right to have liquid
water which we think is necessary for the biological
systems to develop. So there are candidates of
planets outside the solar system which, which can possibly support life. The first ever
picture of a planet outside a solar system
shows the star is so
bright compared to planets, because the planets don't light up on their own, that they manage to mask the star
itself. So we try not to see the star by a mask.
Of course there's some residual light coming
out. But then you look slightly off direction,
you'll find the candidates of these planets.
So, summing this, the stars would come to an end and the bigger
the star is, they will live shorter.
The bigger
star would end up
with a big explosion. That would let all the outside
part of the star
just fly apart, and there remains the core. If the star is big enough,
the core turns into
a black hole. If it's slightly
lighter, it doesn't go all the way to form a black
hole, but leaves some very, very tiny dense core called neutron
stars. So in that case, the entire star becomes only as big as
like ten kilometer like a big atomic
nucleus. So that's the neutron star. If
the star is lighter,
like in the case of our own
sun, again it does blow up leaving very dense core But not as dense
as a neutron star. These objects are
called white dwarfs. So
depending on how massive the star is,
they have different lifetimes and different
things to end up with.
contd.....
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