Unfortunately, an even larger portion cannot be seen by any of these frequencies.ДЄnd yet, certain phenomena such as gravitational lensing, temperature distributions, orbital velocities and rotational speeds of galaxies, and all others that are evidence of a missing mass justify their probable existence. A huge chunk of it is made up of things we canвЂ™t seeДifferent wavelengths in the electromagnetic spectrum such as those of radio waves, infrared, x-rays, and visible light have allowed us to peer into the cosmos and вЂseeвЂ™ huge portions of it. That the Universe is clumped together in certain parts and empty in others is consistent with measurements of the CMBR that show slight variations in temperature during its earliest stages of development.Д§. The vast empty spaces are known as voids.

Some superclusters in turn form part of walls, which are also parts of filaments. By combining galaxy groups and clusters, we come up with superclusters. Large Scale Structures of the UniverseД¬onsidering only the largest structures, the Universe is made up of filaments, voids, superclusters, and galaxy groups and clusters. Once again, measurements by WMAP on the CMBR have revealed a monumental confirmation вЂ“ the Universe is flat.Д¬ombining this geometry and the idea of an invisible entity known as dark energy coincides with the widely accepted ultimate fate of our universe, which as stated earlier, is a Big Freeze. The Earth is not flat вЂ“ but the Universe isД«ased on EinsteinвЂ™s Theory of General Relativity, there are three possible shapes that the Universe may take: open, closed, and flat.

Observations made on globular clusters, which contain the oldest stars, have also pointed to values close to this. Older methods which have contributed to confirming this value include measurements of the abundances of certain radioactive nuclei. The information is based on measurements made on the CMBR. Credit goes to the WMAP team for gathering all the information needed to come up with this number. If you think that is amazing, perhaps equally remarkable is the fact that we know this to better than 1% precision. Although it may seem peculiarly inconsistent with the age of the Universe, which youвЂ™ll read about next, this value is easily understood once you consider the fact that the Universe is expanding at an accelerated rate.Д¤. The Universe spans a diameter of over 150 billion light yearsД¬urrent estimates as with regards to the size of the Universe pegs it at a width of 150 billion light years. It is due to this prediction that the Big Freeze is also known as the Heat Death.Accurate measurements made by the Wilkinson Microwave Anisotropy Probe (WMAP) on the current geometry and density of the Universe favor such an ending.

That is, it will be devoid of any usable heat (energy). This, and data that show that the Universe is cooling allows us to believe that the most probable ending for our universe is that of a Big Freeze. It is never gonna let us relax.вЂќ The most enticing reason to search with gravitational-wave detectors is not to find those things we think must exist, but to find those that lie waiting to be discovered.Observations made especially on galaxies farthest from us show that the Universe is expanding at an accelerated rate. As Richard Feynman put it, вЂњI think Nature's imagination is so much greater than Man's. While we can speculate on all sorts of weird events in the Universe, nature is endlessly surprising. The first microwave telescope found the Cosmic Microwave Background, which conclusively showed that our Universe began in a much smaller and hotter state: the Big Bang. Radio telescopes discovered Quasars, and the Neutron Stars responsible for them. When Galileo used one of his first telescopes, he found moons orbiting Jupiter - providing firm evidence that the Earth was not the center of the Universe. Gravitational waves give us a powerful way to look into places astronomers have never before been able to see - hidden behind walls of luminous matter that interfere with light, or hidden in the deepest recesses of time.Д®ach time scientists have used new instruments to peer into the heavens, they have discovered novel phenomena. While the possibility of finding strange new things that scientists have only dreamt of is tantalizing, even more so is the chance to find objects that physicists have not yet begun to imagine. Certainly the most intriguing prospect behind observing gravitational waves is the great unknown.

The most unknown astronomy