Physics : Dark Matter, The Sun, Other Stars, And Galaxies

To discover what the universe is made of and how it works is the challenge of particle

Saturday,  19  April  2014,  4:38  PM Finished Saturday,  19  April  2014,  5:30  PM 51  mins  31  secs 100.00  out  of  a  maximum  of  100.00

Astronomers believe there is enough dark matter in the universe to slow its expansion gradually toward a stop.

Feldstein, Brian, and Felix Kahlhoefer. "A New Halo-independent Approach to Dark Matter Direct Detection Analysis." Journal of Cosmology and Astroparticle Physics 8 (2014): n. pag. Web of Science. Web. 11 Nov. 2015.

13) When we say a star “moves” on a H-R diagram we are not saying that it is physically moving from one place to another, we are saying that it is transitioning from one stage of its evolutionary life to another. For example we might say it is moving from pre-main sequence to main sequence. This means that the star has moves from an early stage in its life to the middle stage of its life. It has physically stayed in the same place in space.

About 22 years ago WWIII began. They say the world population dropped from 7.5 billion to about 2 billion. Then 1 year later The Dark Sun rose. The Dark Sun is a terrorist group lead by Emperor Sivorisk. They rose from the ashes of the world, and they are the only ones in history to ever achieve what any super villain wants… world domination.

The moons, asteroids and comets are smaller surrounding bodies. The Galaxy is an enormous cloud consisting of stars, gas, and dust. An accumulated gravity of its matter holds the Galaxy together. The Universe is made up of everything that exists. This includes galaxies, stars, and planets.

The particles include photinos, neutrinos, gravitinos, axions, and magnetic monopoles, among many others. Of these, researchers have detected only neutrinos -- and whether neutrinos have any mass remains unknown. Experiments are under way to detect other exotic particles. If they exist, and if one has a mass in the correct range, then that particle might pervade the universe and constitute dark matter.

I have always had an interest in science, especially in the sciences regarding outer space. When I was younger I was always fascinated with rockets, and especially in stars. I have often regretted not pursuing this interest at its infancy. I do remember going to the Planetarium, and studying about a topic that I had seen talked about on television. The topic was black holes, and back then all that they knew was that they were black. The idea of a space in the universe that is completely void of light was difficult to imagine. Recently, I have learned more about this topic and a science call cosmology. I had never even heard of this field of science before I was introduced to a scientist by the name of

The Standard Model of particle physics teaches us the subatomic composition of the universe. It tells the fundamental building blocks which out of this is what the world is made of and the forces in which these blocks interact. The basic building blocks include the six quarks and their other six are leptons. As far as we remember, the four fundamental forces that are present in the universe are gravity, weak nuclear forces, strong nuclear force, and electromagnesim.

In our universe, there is stars, galaxies and other they are made of protons and neutrons and also electrons bundled together into atoms. Most of the universe is it appears is made of something that we don't know about only when there was invisible substance is called dark matter that we did not know about it is 25% of all matters and there is another substance a force that can repel gravity it is known as the dark energy and it is made of 70% of all matter so that makes up 5% of matter of the universe. Dark Matter is different from Dark Energy, Dark Matter can not be seen with the light it is invisible but, according to NationalGeographic.com that “making dark matter impossible to detect with current instruments. But scientists are confident it exists because of the gravitational effects it appears to have on galaxies and galaxy clusters”. For Dark Energy scientist they don't know why, what, how do they know that Dark Matter exists in spaces, Dark Energy is way different from normal matter “dark energy has negative pressure, and it’s this negative pressure that makes gravity

Once the temperature of the Universe dropped below the neutron-proton mass difference, neutrons began decaying into protons. If the early baryon density was low, then it was difficult for a proton to find a neutron with which to make helium before too many of the neutrons decayed away to account for the amount of helium we see today. So by measuring the He/H ratio today, they can calculate the necessary baryon density shortly after the Big Bang, and, consequently, the total number of baryons today. It turns out that you need about 0.05 M total baryonic matter to account for the known proportion of light isotopes. So only 1/20 of the total mass of the Universe is baryonic matter. This is probably the reason why Astronomers claim that Dark matter must exist to account for the gravity that holds galaxies together. If the only matter in the universe was matter we could directly detect, galaxies would not have had enough matter to have ever formed. The galaxies we observe today would fly apart because they wouldn't have enough matter to create a strong enough gravity to hold themselves together. Dark matter is also responsible for amplifying small fluctuations in the Cosmic Microwave Background back in the early universe to create the large scale structure we observe in the universe today.

A galaxy, also called a nebula, consists of billions of stars, interstellar gas, dust, and dark matter which are all bound to form a massive cloud in which we live in. Although it cannot be very well explained, dark matter makes up at least 90% of a galaxy’s mass.

more about dark matter in unknown rather than known. we know how much dark matter there is because of its effect on the expanse of the universe, but besides that, it 's a complete mystery. but it is important we figure it out, because dark energy takes up about 68% of the universe. dark matter takes up approximately 27%,everything else, like the earth, and all of our observed universe and all normal matter, takes up less than 5% of the universe. yet even though it takes up so little of the universe we still call it "normal. dark matter is technically hypothetical since we can 't directly observe it with our telescopes, but the matter takes up the large majority of space itself. It can only be observed by its effect on visible objects in

Dark Matter has been one of the most researched topic in the recent era of science. Even though we have observed e ects of this exotic entity, we are yet to understand its structural form. Thus we are forced to hunt for clues that would help in a better understanding of this component which forms 26:8% of the entire universe. This report delves into the problems that led to the introduction of the concept of Dark Matter. The at Rotation Curve Problem of velocity distribution of galaxies and the Virial Problem have been discussed. The contribution of Dark Matter in the formation of Large Scale Structures have also been looked into. We have also attempted to give an idea about the probable number densities of three Dark Matter candidates assuming that they make up the Dark Matter halos of a Supercluster at redshift, z 0:91 (Kim et al. 2016). We have then discussed the signi cance of understanding the constituents of Dark Matter and its possible beni ts for humanity regarding the generation of energy using annihilation.