What is Reality?
The Universe is commonly defined as the totality of existence, [ 1 ] [ 2 ] [ 3 ] [ 4 ] including planets , stars , galaxies , the contents of intergalactic space , and all matter and energy . [ 5 ] [ 6 ] The broadest definition of universe is that it is simply everything, while a narrower definition is that the universe is limited to what can be observed. [ citation needed ] Similar terms include the cosmos , the world and nature . Scientific observation of the Universe, the observable part of which is about 93 billion light years in diameter, [ 7 ] has led to inferences of its earlier stages. These observations suggest that the Universe has been governed by the same physical laws and constants throughout most of its extent and history. The Big Bang theory is the prevailing cosmological model that describes the early development of the Universe, which in physical cosmology is calculated to have occurred 13.798 ± 0.037 billion years ago. [ 8 ]
Solipsism ( i / ˈ s ɒ l ɨ p s ɪ z əm / ; from Latin solus , meaning "alone", and ipse , meaning "self") is the philosophical idea that only one's own mind is sure to exist.
Reality is the state of things as they actually exist, rather than as they may appear or might be imagined. [ 1 ] In a wider definition, reality includes everything that is and has been , whether or not it is observable or comprehensible . A still more broad definition includes everything that has existed, exists, or will exist. Philosophers , mathematicians , and other ancient and modern thinkers, such as Aristotle , Plato , Frege , Wittgenstein , and Russell , have made a distinction between thought corresponding to reality, coherent abstractions (thoughts of things that are imaginable but not real), and that which cannot even be rationally thought.