Space

Space or Universe is all the space and time and all of it’s contents. Size of the Universe is unknown and possibly infinite. In the Universe there are Galaxies, Stars and Planets. For example, proper spacing and distance between the Earth and the edge of the observed Universe is 46 billion light years. The diameter of the observed Universe would amount to 91 billion light-years if measured at specific times. Including the present, since we can not observe space beyond the edge of the visible Universe. It is unknown whether the size of the Universe finite or infinite. Interestingly, the average Galaxy is 30.000 light-years in diameter, whereas our Galaxy has about 100.000. The typical distance between Galaxies is about 3 million light-years.

There are several theories about the fate of the Universe:

The Big Freeze theory says that the Universe as a result of continuous expansion spend all the gas needed to form Stars and slowly become a dark place.

Hot Death theory suggests that the Universe is reduced to a state without free thermodynamic energy. Therefore can not maintain processes that consume energy. In fact, it follows second law of thermodynamics, which states that entropy tends to increase in an isolated system. If the Universe lasts long enough, it will asymptotically approach the state where all the energy is evenly distributed (maximum entropy).

In other words, in nature there is a tendency for dissipation of temperature and mechanical energy (movement) or extrapolation. There is opinion that the mechanical movement of the Universe stop in the distant future. Hot death does not imply any particular absolute temperature. Only requires that the temperature differences or other processes can no longer be used to perform the job. This is compatible with four theories.

Other Space theory

Big Rip theory says that dark energy increase over time, including acceleration and all matter in the Universe will fall apart in the unbound elementary particles and radiation, torn phantom power where it will end state of the Universe become a singularity, while the density of dark energy and the rate of expansion become infinite.

Big Crunch theory says that the Universe began with a Big Bang and expansion to reach the point where the density of the Universe be enough to stop the spread of the process and turn around and begin contracting. The end result in this scenario is unknown.

Big Bounce theory is a cyclic repetition of the Universe, where the Big Bang in which the first cosmological event result of the dissolution of the previous Universe.

It’s estimated that 100 trillion years from now, the formation of stars will end…