Dark energy what is it? Dark energy is a unknown energy said to take up 70 percent of the universe. The energy is a repulsive gravitational effect that is causing the universe to accelerate out-ward. No one knows exactly what dark energy is or where it comes from.
Dark Energy is a new idea. Little is known about dark energy, yet it takes up a huge amount if the universe.
Scientist were able to show the universe was expanding at an accelerated rate by measuring the red-shift of an object by comparing the spectral lines of the elements and the spectral lines of the same elements measured in a lab. The more distant the objects that emit light the brighter the spectral lines. In 1998 scientist observed that the supernovas are becoming dimmer, which means they are getting closer instead of farther away.
They were able to show that dark energy has an influence on light particles and photons. When a photon passes a galaxy it falls into the gravitational pull, and the dark energy because it repulses gravity makes the photon pass right through the galaxy with even more energy than when it entered. These findings make dark energy completely independent of the supernova observations.
Astronomers have found the first direct evidence of dark energy in the afterglow of the Big Bang, the radiation caused by the Big Bang called cosmic microwave background (CMB). The cosmi...
Dark matter was first proposed by a man named Fitz Zwicky, who was observing a galaxy cluster, and noticed it was much more massive than to be expected, considering the cluster’s luminosity. Zwicky proposed something that he could not see was there, causing this; he dubbed this dark matter. However, Zwicky was ridiculed for this idea. In the 1960s, Kent Ford designed what is now called a spectrograph, a device that disperses electromagnetic radiation, making the radiation visible to the user. This innovation allowed Ford and Vera Rubin to observe the orbital speeds of stars and gases in galaxies from different distances from the central black hole of that galaxy. When doing so, Rubin observed that the Newtonian laws of gravity. The stars closer to the black hole should have been orbiting it at a more accelerated pace than the stars farther away, although this was not happening. Rubin then lead a team of astronomers to observe many galaxies, and in their observations, they noticed that the galaxies evidently had a form of invisible mass at work. The research team discovered spirals encapsulated in what appears to be dark matter. The mass of dark matter is believed to be far greater than the mass of visible matter in the universe. Dark matter is called dark matter for the reason that it does not appear to interact with regular matter in any form,
Additionally, there is the alien hypothesis. It states that a super intelligent technologically advanced civilization built a object known as a Dyson Sphere which is used to drain energy from the star it is built around to power this civilization's energy needs which would actually explain both the faster dimming over time and the blocking of light by a massive object. However a Dyson Sphere would be unlikely because of no solid evidence of alien life yet, although it is odd that SETI would pay such close
Of all the galaxies in the entire Universe these are the closest to our galactic system. About 170,000 light-years away from the Milky Way galaxy lie the Large Magellanic Cloud. With only 15 billion young bright stars, it is just one-quarter the size of our own galaxy. During the winter of 1987, a Canadian astronomer, Ian Shelton, spotted the first naked eye supernova since 1604, the result of a massive explosion. No more exciting and scientifically significant event has occurred over the last decade in science than Supernova 1987A, as it is known. Photographs taken on the night of February 23, 1987, of the Large Magellanic Cloud, a companion galaxy to our own Galaxy, at Canada's southern hemisphere observatory at La Silla, Chile, and at the Siding Springs Observatory in Australia, revealed a 6th-magnitude object where only 12th-magnitude blue supergiant stars had been observed before. Scientists believe that the progenitor of Supernova 1987A is a typical blue supergiant of spectral type B3. Spectra taken in 1977 do not suggest anything unusual happening in the outer layers of the star prior to undergoing the supernova outburst. This is not surprising since the real changes were occurring deep inside in a relatively tiny portion of the star's radius. The Large Cloud is quite important because it is the location of this Supernova 1987A, the exploded star that for a time shone brightly but that is now dim and dead.
Dark Energy is a mysterious force that drives the expansion of the universe. Astronomers states that the universe is expanding and the expansion is accelerating, so the unknown anti-gravity force at work is termed dark energy. Dark energy has important consequences for the evolution of the Universe and the structure within it. The astronomer is in a hunt for dark energy but how can we hunt something we don’t know. Astronomers label it dark energy because it's believed to be the force which cause the universe to expand but what is what the cause of the expression is is not energy. I am pointing this out because some theories misled astronomers.
The number of theories surrounding how the universe materialized is nearly endless, but Krauss’ thesis is one of the most convincing and buttressed that has been proposed. Lawrence Krauss is one of the most well respected theoretical physicists and cosmologists in America and has done extensive research on how and why the universe is in existence. Like the title of his book, A Universe from Nothing: Why There is Something Rather than Nothing, his entire theory surrounds the fact the universe was created from nothing. In support of his argument, he explores the weight and shape of the universe, dark matter and energy, quantum mechanics, visual particles, and expansion rates. While the world may never know exactly how the universe was created, society is getting closer to figuring it out and Krauss may have been the one to figure it out.
13.8 Billion years ago, long before the creation of the popular television show, The Big Bang Theory occurred and is now the most widely recognized cosmological model for the universe. The Big Bang theory is an attempt to explain how the universe we know today began. Over the years, numerous discoveries and research have revealed that our universe did have a beginning, and that there was nothing before the Big Bang occurred. Throughout history there have been other theories as to how our universe began, though the Big Bang still prevails. One of the most exciting parts about the universe is a vast and fascinating place and there are even new discoveries still being made today. The Big Bang theory is widely regarded as the most likely scenario
Dark matter must help make up 25% of the universes mass because if it did not, the elements of the universe would not hold together. This material cannot be directly observed. In the 1950s, studies about other galaxies showed the possibility that there is other matter out there that cannot be seen though the naked eye. In 2014, a particle physicist by the name of Andreas Hoecker who works as a deputy coordinator at the European Organization for Nuclear Research, CERN, stated that supersymmetry is the best theory they have to prove that dark matter exists and what it is. The supersymmetric particles are hypothesized particles that were proven to exist after experiments at the Large Hadron Collider. The Large Hadron Collider helps allow scientists see dark matter particles. The dark matter particles could disappear but they would leave energy and momentum that can be detected. Scientists use the amount of energy and momentum missing to infer that dark matter exists. The Large Hadron Collider can also determine the masses and cross-sections of dark matter.
Now dark flow is a basically a term used to explain astronomical observations, that appear to show certain areas of space accelerating and expanding at a rate that is abnormal in comparison to surrounding regions and the expectation of the acceleration rate that is formed from the basis of laws, rules and models.
Dark Energy is a theoretical repulsive force that counteracts gravity and causes the universe to expand at an accelerating rate. More is unknown than known about Dark Energy. There had been many theories about Dark Energy before HST, but no one had hard evidence. The HST provided evidence
Energy is an odd concept, it is something that is neither here nor there yet has a profound impact on everything, both organic and inorganic. However, energy surrounds us in more ways than is commonly believed; it is possible that matter is only a form of energy. In fact, according to Albert Einstein, matter and energy are different forms of the same thing (“Do Antimatter and Matter Destroy Each Other?”). Through analyzing the superposition of bosons (particles without mass) and fermions (particles with mass), transformations between energy and matter, the creation of mass, and the mass of energy, the existence of what humans consider to be matter will be questioned.
As we discussed in lecture, galaxies are constantly colliding with each other and these collisions shape the structure and evolution of galaxies. “Andromeda II provides direct evidence for the importance of mergers even for the smallest and least luminous of galaxies” (Amorisco et al, 2014, p. 3). By discovering more evidence of galactic collisions, cosmologists and astronomers will be able to determine the effect they have on the Universe. The merging of galaxies allows for them to grow bigger—small galaxies are merged to create ...
The theory really starts by saying there was nothing and then there was something, this is because it is really unknown what existed before. Versions of the theory suggest that the mass known as the universe came from space. Some experts disagree that the mass came from space because they believe that space
The first person to ever observe the Milky Way was Greek philosopher, Democritus, who said the galaxy may consist of distant stars. In 1610, Galileo Galilei used a telescope to study the Milky Way and came to the conclusion that it was composed of billions and billions of faint stars. Then, in 1750, Thomas Wright c...
This is probably the greatest discovery imaginable; however, the universe still seems to be a very controversial subject.