Oscillating universe theory

This is a basic theory to start off. This theory states that the universe goes into a periodic cycle. It has the big bang, and ends with the big crunch or any other theory in which the universe gets obliterated. If this theory is correct then this universe is fourth of fifth along in the line of universes.

Richard Tolman thought of this theory.

Sorry this is short, it was quite a basic theory so not much detail went into it.

Picture- earth from the moon

Remnants of a star

A Black Hole

After a star dies, it takes many forms and as usual, depending on its size and class. The lower class stars fizzle out into a white dwarf which then  takes billions of years to eventually die. For higher class stars, the core collapses into a neutron star. Sometimes it forms a protostar which has cosmic rays spewing out of both its poles. The biggest stars can collapse under its own gravity and make a black hole.

During the death of lower class stars, they expand into a red giant. These stars can form naturally but are extremely rare. Anyway, there are quite a few of these which used to be like our sun. In fact, out sun will become a red giant in five billion years!

Well that's it, for the whole star topic, I wanted to do the star topic until I thought of a big one. Its going to be theorems about the universe.

Picture- O class star

The blue light is an
O class star

The death of a star

After a certain amount of time, a star runs out of hydrogen. The size and class of a star decides how long a star lasts, with the M class stars lasting the longest and O class dying the fastest. Anyway, when the hydrogen stores are depleted, it will move on to helium, and burn that, until it reaches the element iron, which starts the death.

The type of death depends on its size and class. M and K classes just fizzle out, but G and F expand into one hundred times its size before shrinking into a white dwarf, but the big stars- A,B and O have very violent deaths. The core expands until the outer material of the star explodes into space. Sometimes the core collapses to become a neutron star. This is a supernova. Another possibility is a black hole. This is when a star collapses under its own gravity!

This post is done now! Make sure to share this blog on facebook and twitter and smash that google like button!

picture-Red and Dead galaxy

This galaxy has many dead stars. This is why
its called a red and dead galaxy.

Birth of a star

A star is born in a nebula, a cloud of hot gas, sometimes from a dead star. There are several types of nebulae and these include an emission nebula, dark nebula, planetary nebula and many more. A star forms when the cloud of gas collapses into a dense ball. 

Artists impression of
a T class star

After it has collapsed and more gas has swirled into it, nuclear fusion starts, if the star fails to star it becomes a brown dwarf which are classes L,T,Y. More gas continues to go into the star until it stops growing. The star is born and now creates a gravitational pull to form gas giants and create terrestrial planets.