Universe

The universe is the whole spacetime continuum in which we exist, together with all the energy and matter within it. Attempts to understand the universe in this sense, on the largest possible scales, are made in cosmology, a science that has grown from physics and astronomy. During the second half of the 20th century, the development of observational cosmology, also called physical cosmology, led to a split in the meaning of the word universe, between observational cosmologists and theoretical cosmologists; where the former (usually) abandon the hope of observing the whole spacetime continuum, the latter retain this hope, attempting to find the most reasonable speculations for modeling the whole of spacetime, despite the extreme difficulty in imagining any empirical constraints on these speculations and the risk of declining into metaphysics.

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The terms known universe, observable universe, or visible universe are often used to describe the part of the universe that we can see or otherwise observe. Those who believe it is impossible to observe the whole continuum may use our universe, referring only to that knowable by human beings in particular.

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Spacetime: :See Space-time theories of consciousness for the philosophy topic....

Energy: Energy is a fundamental quantity that every physical system possesses. Energy of physical system in a certain given state is defined as the amount of work W needed to change the state of the system from some initial state (called reference state or reference level) to the given state....

Matter: Matter is commonly referred to as the substance of which physical objects are composed. In physics, it is everything that is constituted of elementary fermions. Philosophically, matter constitutes the formless substratum of all things, which exists only potentially and from which reality is produced...

Universe related Images and Photos (experimental)

Dolphin Universe	Beloved Universe	LEGO Universe PC	The Universe-Logo
The Universe Chart	Elliptical Universe	Marvel Universe Mug	Marvel Universe Journal
Stargate Universe-Destiny	The Universe Season 4 DVD	Marvel Universe Tin Case Art Set	Stargate Universe Coaster Set