Galaxies in Our Universe Essay

Galaxies in Our Universe Essay

Length: 757 words (2.2 double-spaced pages)

Rating: Better Essays

Open Document

Essay Preview

Introduction
The Universe is a collection of millions of galaxies and extends beyond human imagination. After the big bang, the universe was found to be composed of radiation and subatomic particles. Information following big bang is arguable on how galaxies formed, that is whether small particles merged to form clusters and eventually galaxies or whether the universe systematized as immense clumps of matter that later fragmented into galaxies (Nasa World book, 2013). A galaxy is a massive area of empty space full of dust, gases (mainly 75% Hydrogen and 25%Helium), atoms, about 100-200 billion stars, interstellar clouds and planets, attracted to the center by gravitational force of attraction. Based on recent research, 170 billion galaxies have been estimated to exist, with only tens of thousands been discovered (Deutsch, 2011).

Structure of Galaxies
Astronomers believe that most galaxies consist of a supermassive black hole at the center, which attracts all constituents of galaxies such as, dust, gases (mainly Hydrogen and Helium), atoms, stars, interstellar clouds and planets to the center by force of gravity, but are not sure whether all galaxies contain a black hole in the center. Galaxies keep moving in relative motion to one another and intermittently can come so close that the force of gravitational attraction between the galaxies may become strong enough to cause a change in the shape of the galaxies, while in exceptional cases, the galaxies may collide. If two galaxies collide, they may pass right through without any effect or may merge, forming strands of stars, extending beyond 100,000 light years in space (World Book Online Reference Centre, 2005). Hence, neighboring and often other colliding galaxies induce the sha...


... middle of paper ...


... on research, On 2 August 2007 approximately more than 10 million images of galaxies had been classified by the galaxy zoo program (Galaxy Zoo).

Conclusion
Generally, the universe began as a composition of radiation and subatomic particles, which proceeded with galaxies formation. Galaxies are made up of hydrogen, helium, 100-200 billions of stars, planets and most having a black hole at the center, which attracts everything present in galaxies by force of gravity. Galaxies can be classified as either spiral (Milky Way- galaxy which human kind has been found to exist), elliptical, lenticular and irregular, where the structure is determined by neighboring galaxies with most galaxies are moving away from each other. Classification of galaxies is being conducted by online programs such as Galaxy zoo, using pictures from telescopes and is making significant progress.

Need Writing Help?

Get feedback on grammar, clarity, concision and logic instantly.

Check your paper »

Reasons for the Existence of the Big Bang Essay example

- The Big Bang is the theory that the universe was once much smaller and hotter than it is now, and it has been expanding and cooling over time. With an understanding of a few key pieces of evidence one can understand the basis of the theory. The strongest pieces of evidence for the Big Bang are the movement of distant galaxies, the expansion of space time, and the hydrogen and photons in the universe. Measurements of the motion of distant galaxies reveal that they are all moving away from us, with farther galaxies moving away at higher speeds....   [tags: universe, galaxies, space-time]

Better Essays
628 words (1.8 pages)

Essay about The Merging of Galaxies

- A dwarf galaxy is, “a small galaxy composed of up to several billion stars—a smaller amount compared to our own Milky Way’s Galaxy’s 200-400 billion stars” (Wikipedia). On February 23, 2014, it was reported that two galaxies that had once orbited around the Andromeda Galaxy were merging together. The collision created a stream of stars in one of Andromeda’s dwarf galaxies, Andromeda II. Researchers then observed the stream of stars by separating them into categories and trying to analyze which could be members of Andromeda II versus those that could be “dwarf foreground stars from the Milky Way halo” (Amorisco et al, 2014, p 4)....   [tags: Astronomy, Universe]

Better Essays
713 words (2 pages)

Essay about The Origins of the Universe

- Who or what made the universe. How did it begin. Humans have always wondered: Has the universe always existed like we see it now, or did it somehow start all of a sudden. In the past century, it was discovered that the universe was expanding and people wondered why. These are the questions the Big Bang theory tries to answer. While no one is completely sure of all the details about it, the big bang is the most widely accepted theory about the beginnings of our universe. The big bang theory states that the universe began by expanding from an infinitesimal volume with extremely high density and temperature....   [tags: big bang, church, galaxies]

Better Essays
1130 words (3.2 pages)

The Expansion of the Universe Essay

- ... The big bang theory started 15 million years ago and it was a massive explosion and is still expanding; and will never stop expanding. The Big Bang theory is science's best explanation of how the universe was created. The big bang theory is telling us that our entire universe was created by these little tiny (they are like billions of times smaller than a little proton), super mega dense, super multi mass exploded and began expanding very quickly, eventually cooling and forming into the stars and many of the galaxies with which we are familiar with....   [tags: galaxies, big bang]

Better Essays
1248 words (3.6 pages)

Essay on Discovery of the Expansion of the Universe

- For thousands of years it was believed that our Universe was finite. In 1920, The Great Debate, also called the Shapley-Curtis Debate happened in Washington where Shapley argued that our Milky Way was the only galaxy in the Universe and Curtis argued that there were many other galaxies in the Universe but none of the opponents had any concrete evidence to prove their respective theories. However, in 1929 Edwin Hubble provided observational evidence from which he concluded that there was millions of galaxies in the Universe beside our Milky Way Galaxy....   [tags: galaxies, astronomers, moving]

Better Essays
810 words (2.3 pages)

The Universe and It's Phenomenons Essay

- The universe is an unknown place. Most of it has not been explored. Some things are known, however. Scientists know a lot about things like the Big Bang and our Asteroid Belt. Some of the universe's natural phenomenons are yet to be discovered. This article will explain some of them and why they happen. In the year 1929, Edwin Hubble made a revolutionary discovery. He learned that the universe is expanding. He saw that the galaxies were each moving away from us. Edwin knew that for one instance of time, almost 14 billion years ago, all of the mass of the universe was contained in a single spot....   [tags: big, bang, asteroid belt, expanding universe]

Better Essays
1075 words (3.1 pages)

Discovery of the Expansion of the Universe Essay example

- Shapley's View of the Universe Harlow Shapley's main arguments were: (1) Our Galaxy was very large, approximately 300,000 light years in diameter. This measurement was quite drastic, compared to the previous measurement made. (2) Sun was not at the center of the galaxy, it was approximately 60,000 light years away. This is because the globular clusters were observed to be concentrated towards one half of the sky. Also, the distances of the variable stars implied that the globular clusters were far away....   [tags: fine universe, cosmology, milky way galaxy]

Better Essays
1814 words (5.2 pages)

The Origin and Structure of our Universe Essay

- I suppose that the Universe we can observe and cognize consists of self-developing hierarchically co-subordinate and genetically relative systems of cosmic bodies. Each of the systems is distinguished by the qualitative state of substance composing its bodies but main evolution mechanisms are common to all the systems. What is common to all the systems. The central most massive body of every system is a parental body for its younger members. The central massive body of every system at intervals conceives in its interiors new cosmic bodies to put them into initial (circum-parental) orbits....   [tags: Physics Universe Space Science Essays]

Better Essays
3944 words (11.3 pages)

Quasars and Active Galaxies Essay

- Quasars and Active Galaxies The astronomical world is full of phenomena beyond the average person’s imagination. The technical tools and analytical methods astronomers use are very complex. The enormous numbers and distances are mind boggling. Theories behind astronomical phenomena are based on yet another theory. In order to understand the concept of quasars and active galaxies, one must first have a feel for the astronomical numbers involved. Secondly, a basic knowledge of the tools of the trade, and finally, a working knowledge of astronomical jargon....   [tags: Essays Papers]

Better Essays
1289 words (3.7 pages)

Essay on The Universe

- The Universe Luminosity is the amount of light that is radiated from a star. White light is the composition of all colors. In elements, the energy discharge can be displayed as light. Just by looking at the colors that are discharged, one may precisely identify the element. In understanding the universe, the Doppler effect is one of the most important tools. The Doppler effect is a shift in frequency due to a moving source. Skipping a rock on water would be an example of this effect. The circles would be off center because the rock is a moving source....   [tags: Papers]

Better Essays
2520 words (7.2 pages)