https://www.livescience.com/33129-total-energy-universe-zero.html
In the case of a universe that is approximately uniform in space, one can show that this negative gravitational energy exactly cancels the positive energy represented by the matter. So the total

https://www.newscientist.com/lastword/mg25333771-200-if-energy-cannot-be-created-or-destroyed-where-does-it-come-from/
Some scientists believe that the total energy of the universe is zero, because positive and negative energies cancel each other out. This implies that the big bang could have been a quantum fluctuation and that matter and energy are equivalent.

https://www.cfa.harvard.edu/big-questions/what-universe-made
Matter and energy are the two basic components of the entire Universe. An enormous challenge for scientists is that most of the matter in the Universe is invisible and the source of most of the energy is not understood. ... As for dark energy, Einstein had assumed the Universe was static, neither expanding nor collapsing. However, his Theory of

https://science.nasa.gov/universe/the-universe-is-expanding-faster-these-days-and-dark-energy-is-responsible-so-what-is-dark-energy/
Dark energy is an unknown force that makes the universe expand faster over time. Learn about its history, discovery, and how it relates to Einstein's theory of general relativity.

https://science.nasa.gov/exoplanets/what-is-the-universe/
The universe contains all the energy and matter there is. Much of the observable matter in the universe takes the form of individual atoms of hydrogen, which is the simplest atomic element, made of only a proton and an electron (if the atom also contains a neutron, it is instead called deuterium). Two or more atoms sharing electrons is a molecule.

https://en.wikipedia.org/wiki/Dark_energy
In physical cosmology and astronomy, dark energy is an unknown form of energy that affects the universe on the largest scales. Its primary effect is to drive the accelerating expansion of the universe.Assuming that the lambda-CDM model of cosmology is correct, dark energy is the dominant component of the universe, contributing 68% of the total energy in the present-day observable universe

https://en.wikipedia.org/wiki/Universe
The physical universe is defined as all of space and time (collectively referred to as spacetime) and their contents. Such contents comprise all of energy in its various forms, including electromagnetic radiation and matter, and therefore planets, moons, stars, galaxies, and the contents of intergalactic space. The universe also includes the physical laws that influence energy and matter, such

https://science.nasa.gov/astrophysics/science-questions/how-do-matter-energy-space-and-time-behave-under-the-extraordinarily-diverse-conditions-of-the-cosmos/
Learn about the mysteries of dark energy and dark matter that affect the expansion and structure of the universe. Find out how NASA missions and telescopes are exploring these phenomena and more.

https://www.sciencefocus.com/space/the-six-numbers-that-define-the-entire-universe
The six numbers that define the entire Universe - BBC Science Focus Magazine.

https://sciculture.net/astronomy/what-is-the-total-energy-of-the-universe/
Learn how positive and negative energies balance out in the Universe, creating a zero energy state. Explore the possibility of a zero energy universe emerging from quantum fluctuations and inflation.

https://www.scientificamerican.com/article/energy-can-neither-be-created-nor-destroyed/
The universe itself is a closed system, so the total amount of energy in existence has always been the same. The forms that energy takes, however, are constantly changing.

https://en.wikipedia.org/wiki/Observable_universe
Dark matter (26.8%) Dark energy (68.3%) [6] The observable universe is a ball-shaped region of the universe consisting of all matter that can be observed from Earth or its space-based telescopes and exploratory probes at the present time; the electromagnetic radiation from these objects has had time to reach the Solar System and Earth since the

https://www.britannica.com/science/universe
The " observable universe " is the region of space that humans can actually or theoretically observe with the aid of technology. It can be thought of as a bubble with Earth at its centre. It is differentiated from the entirety of the universe, which is the whole cosmic system of matter and energy, including the human race.

https://physics.stackexchange.com/questions/361875/what-is-the-total-energy-of-the-universe
Regarding the total energy content of the Universe, that's relatively straightforward. The Universe is observed to have flat geometry, or very nearly so, which means it must have near-critical energy density. The critical density is simply $3H^2/8\pi G$, and can be derived from the Friedmann equations. To give a number with dimensions:

https://www.energy.gov/science/doe-explainscosmology
The universe's total energy budget consists of approximately 5 percent regular matter, 27 percent dark matter (which interacts with ordinary matter via gravity but does not interact with light), and 68 percent dark energy. That's why learning more about dark matter and dark energy is so important for science.

https://www.scientificamerican.com/article/the-evolution-of-the-universe/
Some 15 billion years ago the universe emerged from a hot, dense sea of matter and energy. As the cosmos expanded and cooled, it spawned galaxies, stars, planets and life. By P. James E. Peebles

https://www.livescience.com/what-is-the-universe
The universe is literally everything, the sum of all existence. It includes all matter, like stars and galaxies. The universe also includes all radiation and all other forms of energy. No matter

https://science.nasa.gov/universe/overview/
Learn how the universe evolved from cosmic inflation to the big bang, nucleosynthesis, recombination, dark ages, first stars, and reionization. Explore the mysteries of dark energy, dark matter, and the cosmic microwave background.

https://physics.stackexchange.com/questions/40983/is-the-total-energy-of-the-universe-constant
Energy conservation stems from Noether's theorem applied to time (i.e., time-invariance leads to energy conservation, similarly to how spatial-invariance leads to momentum conservation). Since the universe is expanding (and accelerating at that), the state of the universe today is different than it was yesterday and will be tomorrow, hence energy conservation cannot be established for the

https://en.wikipedia.org/wiki/Big_Bang
The Big Bang is a physical theory that describes how the universe expanded from a primordial state of high density and temperature. It was first proposed as a physical theory in 1931 by Roman Catholic priest and physicist Georges Lemaître when he suggested the universe emerged from a "primeval atom". Various cosmological models of the Big Bang explain the evolution of the observable universe

https://www.scientificamerican.com/article/energy-in-the-universe/
The energy flows on the earth are embedded in the energy flows in the universe. A delicate balance among gravitation, nuclear reactions and radiation keep the energy from flowing too fast.

https://www.space.com/where-is-the-center-of-the-universe
The universe is undeniably vast, and from our perspective, it may seem like Earth is in the middle of everything. ... The BBT says we don't understand 95% of the matter and energy needed to fit

https://theconversation.com/100-years-ago-our-understanding-of-the-universe-exploded-225865
The new perception of the size of the universe allowed Hubble, several years later, to go further and propose Hubble's Law, a theory of the expansion of the universe, yet later shown to have

https://www.economist.com/science-and-technology/2024/06/19/the-dominant-model-of-the-universe-is-creaking
DESI, as its name suggests, is a tool to investigate the nature of dark energy, a mysterious entity that accounts for 68% of everything in the universe and which pushes space apart in a repulsive

https://en.wikipedia.org/wiki/Zero-energy_universe
The zero-energy universe hypothesis proposes that the total amount of energy in the universe is exactly zero: its amount of positive energy in the form of matter is exactly canceled out by its negative energy in the form of gravity. [1] Some physicists, such as Lawrence Krauss, Stephen Hawking or Alexander Vilenkin, call or called this state "a

https://phys.org/news/2024-06-scientists-massive-energy-imbalance-saturn.html
A discovery by researchers at the University of Houston has revealed a massive energy imbalance on Saturn, shedding new light on planetary science and evolution and challenging existing climate

https://www.popularmechanics.com/science/a61208306/is-consciousness-real/
The Universe Could Be Eternal, This Theory Says. Immortality Is Impossible Until We Beat Physics. How Vacuum Energy Could Help Us Reach Light Speed. Advertisement - Continue Reading Below.

https://en.wikipedia.org/wiki/Accelerating_expansion_of_the_universe
In the decades since the detection of cosmic microwave background (CMB) in 1965, the Big Bang model has become the most accepted model explaining the evolution of our universe. The Friedmann equation defines how the energy in the universe drives its expansion. = (˙) = where κ represents the curvature of the universe, a(t) is the scale factor, ρ is the total energy density of the universe

https://science.nasa.gov/missions/webb/first-of-its-kind-detection-made-in-striking-new-webb-image/
Alignment of bipolar jets confirms star formation theories For the first time, a phenomenon astronomers have long hoped to directly image has been captured by NASA's James Webb Space Telescope's Near-Infrared Camera (NIRCam). In this stunning image of the Serpens Nebula, the discovery lies in the northern area (seen at the upper left) of this […]

https://www.cnn.com/2024/06/14/world/catan-new-engeries-game-universe-cec/index.html
When development on New Energies started in 2011 there were three renewable energy sources: wind, water and solar. This, among other things, made it "very complicated," says Teuber.