It's at least a sphere of radius 13.7 light-years in radius.
It can be almost any size. A star's size is predetermined by its mass and changes little for most of its existence.
The actual existence of the star or planet Kolob is questionable. It is part of the Mormon bible and is said to have 1,000 year long days. The size is not known.
At the end of season/series 5 of Doctor Who, a crack in the universe had completely eradicated everything but the earth from existence. The Doctor flew the Pandorica into the exploding TARDIS and scattered genetic and biological information about the entire universe to recreate it, in effect creating a second "big bang".
If you mean do they come into existence and later cease to exist, the answer is; not on their own. In this sense they are like big rocks orbiting a star (sun), and as long as the sun is there they will be there. But, eventually the sun they orbit will explode and destroy them.
There is no evidence yet to suggest their is an existence of aliens... But in the future, who knows?
Their existence is not proven.
When Matter and anti-matter collided the Big Bang came into existence. But something still remains a mystery that how did the Matter and anti-matter come.
The existence of a big number of island opposite the western coast of the arabian gulf is because of the depression of the gulf.
Possibly. Their existence has neither been proven or dis proven.
The "Big Bang Theory" may account for the events that happened during the first few seconds or minutes of the universe's existence. It doesn't purport to explain anything more recent than that.
Yes, that is the big secret. Someday we will wake up though.
The existence, isotropy, and spectrum of the cosmic microwave background radiation (cmbr) is extremely easy to explain if Big Bang Cosmology is true; it is impossible to reasonably explain even its existence with any alternate cosmological hypothesis.
Big Brother might possibly be an example of doublethink by the Party, as his existence is not confirmed. He is probably used by the Party as a propaganda tool.
Within ten seconds of the start of the Big Bang, all hadrons and leptons that now reside in our Universe came into existence.
How ever big they want. It usually ranges from barley there (orbs) to full size (apperiton) or how big they were when they died. Hope it helped Ghosts can not exist. Their existence would violate the Laws of Physics.
Existence is a fundamental aspect of reality that is difficult to explain beyond the fact that things simply exist. Philosophers and scientists continue to debate about the origins and nature of existence, with no definitive answer. Some theories suggest that existence may be a consequence of the laws of physics or a byproduct of the universe's expansion.
The existence of galactic clusters is consistent with the Big Bang although it would be equally consistent with the alternative Steady State theory.