Dr. Bonnor supports the idea that the universe both expands and contracts, that in several billion years the expansion will slow up and reverse itself and that the contraction will set in.

This, he claims, would reasonably account for the expansion of the universe.

The graphic scheme above is an artist's concept illustrating the expansion of a portion of a flat universe.

In 1931 Lemaître went further and suggested that the evident expansion of the universe, if projected back in time, meant that the further in the past the smaller the universe was, until at some finite time in the past all the mass of the Universe was concentrated into a single point, a " primeval atom " where and when the fabric of time and space came into existence.

There were two primary explanations put forth for the expansion of the universe.

Cosmologists are still unable to explain all cosmological phenomena exactly on the basis of known conventional forms of energy, such as those related to the accelerating expansion of the universe.

Cosmologists therefore invoke a yet unexplored form of energy called dark energy ( dark energy is a hypothetical form of energy that permeates all of space and tends to accelerate the expansion of the universe ) which account for certain cosmological observations mostly related to " accelerating expansion of Universe ".

Thus with the expansion of the universe, radiation becomes less dominant than matter.

The very early universe is said to have been ' radiation dominated ' and as such radiation controlled the deceleration of expansion.

The solution is an expanding universe ; due to this expansion the radiation and matter in the universe are cooled down and become diluted.

At first, the expansion is slowed down by gravitation due to the radiation and matter content of the universe.

However, as these become diluted, the cosmological constant becomes more dominant and the expansion of the universe starts to accelerate rather than decelerate.

As a rule of thumb, a scattering or a decay process is cosmologically important in a certain cosmological epoch if the time scale describing that process is smaller or comparable to the time scale of the expansion of the universe, which is with being the Hubble constant at that time.

The case for dark energy was strengthened in 1999, when measurements demonstrated that the expansion of the universe has begun to gradually accelerate.

In physical cosmology, cosmic inflation, cosmological inflation or just inflation is the theorized extremely rapid exponential expansion of the early universe by a factor of at least 10 < sup > 78 </ sup > in volume, driven by a negative-pressure vacuum energy density.

As a direct consequence of this expansion, all of the observable universe originated in a small causally connected region.

Another adjunct, the varying speed of light model has also been theorized by Jean-Pierre Petit in 1988, John Moffat in 1992 as well Andreas Albrecht and João Magueijo in 1999, instead of superluminal expansion the speed of light was 60 orders of magnitude faster than its current value solving the horizon and homogeneity problems in the early universe.

Authors writing in the Lovecraftian milieu use elements of the Mythos in an ongoing expansion of the fictional universe.

Uniform cooling of the cosmic microwave background over billions of years is explainable only if the universe is experiencing a metric expansion.

Cleaver said positive dark energy is currently responsible for speeding up the expansion rate of our universe as time moves on.

If the expansion of the Universe continues to accelerate, there is a future horizon as well.

The steam then goes back into an intermediate pressure section of the turbine and continues its expansion.

* 1271 – April 8 – Mamluk sultan Baibars continues his territorial expansion, capturing the strategically important castle Krak des Chevaliers from the Knights Hospitaller in present-day Syria.

* April 8 – Mamluk sultan Baibars continues his territorial expansion, capturing the strategically important castle Krak des Chevaliers from the Knights Hospitaller in present-day Syria.

The number of these peoples who are as yet relatively untouched by external influences continues to decline significantly, however, along with the near-exponential expansion of urbanization, roads, pastoralism and forest industries which encroach on their customary lands and environment.

Vietnam is putting considerable effort into modernization and expansion of its telecommunication system, but its performance continues to lag behind that of its more modern neighbors.

Rapid campus expansion began in the 1950s and continues to the present day.

After this, as the fluid continues its expansion, the temperature drops.

Now in its 135th year, the library building has experienced floods, fires and at least six separate renovations or expansion projects but continues to endure today as a focal point of the Hamilton community.

If the growth continues, it is possible that Atoka could begin to see the type of expansion currently underway across the Red River to the south.

Agriculture expansion of the central and southern regions of the prefecture was in contrast to the depopulation of these areas as a significant part of the population moved to the northeast of the prefecture as a result of the urbanization of Japan, a process that continues into the 21st century.

If entropy continues to increase in the contracting phase ( see Ergodic hypothesis ), the contraction would appear very different from the time reversal of the expansion.

The book made headlines around the world, and began a debate about the limits of Earth's capacity to support human economic expansion, a debate that continues to this day.

Assuming dark energy remains constant ( an unchanging cosmological constant ), so that the expansion rate of the universe continues to accelerate, there is a " future visibility limit " beyond which objects will never enter our observable universe at any time in the infinite future, because light emitted by objects outside that limit can never reach points that expand away from us at less than the speed of light.

Construction on this expansion continues to date.

There is currently a plan in place for future expansion of the airport as it continues to grow in passenger volume.

The expansion Silent Threat continues the story in a straightforward manner.

PCs continue to rely on third-party devices for in-game sound reproduction, and SoundBlaster, despite being largely the only major player in the entertainment audio expansion card business, continues to advance its product development at a significant pace.

Work continues on expansion of gas grid, heat distribution system, and water-sewage hookups.

Highway expansion continues to be an ongoing process because the roads running alongside the rivers are among the heaviest used in the country.

Birmingham continues to develop, following the removal of the Inner Ring Road, which acted as a ' concrete collar ' preventing the expansion of the city centre, a massive urban regeneration project known as the Big City Plan in progress.

Despite these setbacks Metra continues to seek expansion options and to improve passenger service.

The track continues for about a block east of the King George station ; this spur is currently used for parking unused cars, but is designed to hook up to any future eastern expansion of the Expo Line.