The expanding universe

The work builds on the Nobel Prize—winning discovery of the accelerating universe.

The expanding universe

However, when Einstein tried to apply his General Theory of Relativity to the universe as a whole, he realized that space-time as a whole must be warped and curved back on itself, which in itself would cause matter to move, shrinking uncontrollably under its own gravity.

Thus, as early asEinstein and others realized that the equations of general relativity did not describe a static universe.

Adding additional and arbitrary terms to a theory is not something that scientists do lightly, and many people argued that it was an artificial and arbitrary construct and at best a stop-gap solution.

Weird Object: Fermi Bubbles |

To put things into perspective, for most of history see the section on Cosmological Theories Through Historyit had been taken for granted that the static earth was the center of the entire universeas Aristotle and Ptolemy had described.

It was only in the midth Century that Nicolaus Copernicus showed that we were not the center of the universe at all or even of the Solar System for that matter!

The expanding universe

Then, inhumanity suffered a further blow to its pride when Curtis Shapely revealed that we were not even the center of the galaxymerely part of some unremarkable suburb of the Milky Way although it was still assumed that the Milky Way was all there was.

Some years later, inthe American astronomer Edwin Hubble stunned the scientific community by demonstrating that there was more to the universe than just our Milky Way galaxy and that there were, in fact, many separate islands of stars - thousands, perhaps millions of them, and many of them huge distances away from our own.

Then, inHubble announced a further dramatic discovery which completely turned astronomy on its ear. In effect, all the galaxies we see are slightly red in color due to redshift.

Tonight's Sky — Change location

The exact value of the Hubble constant itself has long been the subject of much controversy: It should perhaps be pointed out that the Hubble constant is technically a parameter, not a constant, because it will actually change over long periods of time.The Universe is expanding. Wow, I still love being able to write that down.

It's such a wonderful, compact, simple statement, yet has implications so profound it . [Physics FAQ] - Original by Philip Gibbs Where is the centre of the universe? There is no centre of the universe!

According to the standard theories of cosmology, the universe started with a "Big Bang" about 14 thousand million years ago and has been expanding ever since.

Discomfort Zone: How to Master the Universe

Carolyn Mackler is the acclaimed author of the YA novels The Earth, My Butt, and Other Big Round Things (a Michael L. Printz Honor Book), Infinite in Between, Tangled, Guyaholic, Vegan Virgin Valentine, and Love and Other Four-Letter Words, as well as the co-author of The Future of also wrote the middle grade novel Best Friend Next Door.

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The expanding universe

This expansion, usually referred to as the "metric expansion" of space, is a “broad-brush effect” in that individual galaxies themselves are not expanding, but the clusters of galaxies into which the matter of the universe has become divided are becoming more widely separated and more thinly spread throughout space.

Thus, the universe is not expanding "outwards" into pre-existing space. The expanding universe is finite in both time and space. The reason that the universe did not collapse, as Newton's and Einstein's equations said it might, is that it had .

Expansion of the universe - Wikipedia