Lecture notes
learn about myserious things in space
- Module
- All of Astrophysics
- Institution
- AQA
Learn on Stars in space
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Evolution of a star, supernova, black holes andquasars.
A star that you see in the sky is formed through loads of phases
and It’s even more beautiful when you see it yourself.
A star first starts as a Nebula, a giant cloud of gas and dust
then becomes a protostar which is formed under gravity. After
that, the protostar becomes a main sequence, but what happens
next?
A main sequence can become two different giants under certain
conditions. If a main sequence has less than 3 solar masses it
becomes a Red Giant, if it has more than 3 solar masses, it
becomes a Red Supergiant.
A Red giant can involve into a massive explosion(supernova) or a
white dwarf then a back dwarf.
However, a Red Supergiant goes straight away into a supernova.
If in an exam, they ask you what elements were involved in these
formation of a star, just remember, it’s helium, oxygen, carbon
and beryllium.
A supernova after the explosion can become 2 dangerous things a
black hole and a neutron star. You wouldn’t want to go anywhere
near those. If you go near a neutron star, you will be squished
and span around like a beyblade. Whereas a black hole will turn
you into a spaghetti strand. And a black hole is capable of
swallowing a star, planets and planets whole but there is nothing
to fear because you can find out how big the radius of a black
hole using Schwarzchild radius.
But there is an even bigger treat in the centre of every galaxy in
the universe.
A supermassive black hole is made from large amounts of matter or
black hole doing a fusion dance with another black hole.
You might also be wondering, when you look through a telescope
faced towards a galaxy, you wonder why is it orbiting so quick?
The reason is, a supermassive object at the centre with a very
strong gravitational field attracting them.
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