Picture-kepler 22b

The first habitable planet

How the universe could end

I think I've already done this, so if I have, count this as a re-post.

There a several theories of how the universe could end, but the main three are the big crunch, the big rip and the big freeze. The big crunch states that the universe will start to contract until it collapses in on its self. The big rip is when dark energy takes over dark matter and the expansion of the universe goes so fast that it rips everything apart, starting with the biggest objects. The final theory is the big freeze, where the stars will eventually burn out and the galaxies will eventually fade out until there is nothing left in the universe.

All of these won't happen for trillions of years which means we'll all be dead by then.

I can't post for around a week due to some events that have happened, but until them, good bye

Picture- Cosmic Background Radiation

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