Frontiers of Astronomy
26 April 2017
Our Galactic Universe
1. Galaxies can be as large as a few thousand to several hundreds of thousands of light years across.
2. Astronomers, at the time this was released, believe that there are over a hundred billion galaxies in the universe.
3. It is estimated that a light year is 5.88 trillion miles.
4. Galaxies come in three different main type shapes. There are spiral, elliptical, and irregular.
5. Spiral galaxies usually have a large flat disk…
6. Lenticular are similar to spiral galaxies except that there is no spiral structure and most stellar formation has ceased.
7. Elliptical galaxies are smooth and elliptical in appearance. An analogy of this type of galaxy is a “cosmic football.”
8. Irregular galaxies have no definite structure and are typically small.
9. Dwarf irregular galaxies are the most common type of galaxies in the universe.
10. Astronomer Edwin Hubble is credited with classifying the different types of galaxies in 1936.
11. Hubble believed that all galaxies start off as elliptical changed into spirals later on in its life, and finally becomes a spiral galaxy. We now know that once a type of galaxy forms it does not change shape.
12. Unlike the Milky Way, most stars in different galaxies have pairs. These pairs of stars are known…
The Milky Way is a barred spiral galaxy, which looks like a pinwheel. At times, people can look up to the sky and see the faint band of light, the glow of stars in the galaxy’s disk, which gave the Milky Way its name. The galaxy is of an average size, 100,000 light-years across and 1,000 light-years deep. It contains about 500 billion stars and many planets. The center of the galaxy contains a supermassive black hole, which is the cause of our galaxies spiral space. Within the galaxy, there are…
of the radiation emitted from a "normal" galaxy is in the form of visible light, like that of the radiation of ordinary stars, AGNs are prominent across the entire electromagnetic spectrum. Thus, astronomers needed to look beyond the visual regime to see their full potential. Recent technological advancements, such as satellite deployment, have enabled astronomers to explore energies once unattainable. In addition to the showing in a wide range of energies, AGNs also change in brightness on time…
Normal sized galaxies; such as the Milky Way galaxy, can contain an estimated 400 billion stars. In someone’s mind who knows nothing about Astronomy, they think that the larger the amount of stars, the more crowded the galaxy is. The truth is, that stars and planets are so far apart, the chances of them colliding with each other are small. That…
NGC 584 is an elliptical galaxy in the constellation Cetus. The galaxy was discovered on 10 September 1785 by the German-British astronomer William Herschel. Number 20 in the Herschel 400 list is NGC 584. NGC 584 is a moderately large and bright elliptical galaxy in Cetus. In an 18 inch telescope it appears as an elongated patch of light with a bright center. The two bright galaxies either side of NGC 584 are the 13.2 magnitude NGC 582; (left) and the 15.2 magnitude PGC 1028168. (Right). While…
Nuclear Fusion and the Remains of a Dead Star
Throughout the history of Earth, multicellular organisms rely on one thing, the sun. And throughout the observable universe, there are million of stars out there just like our sun. These stars could be different however, with either more mass, volume, heat, etc. In our high school career, we learn a lot about astronomy, such as the order of the planets in our solar system. We also learn about gravity, rotation of planets, and how long it takes…
Picture you are on Earth 5 billion years into the future. The sun is closing in on Earth and the Earth is burning up. What are you going to do? This is why it is so important to explore space, because humans could go extinct if we don’t find another planet to colonize on before the sun swallows Earth. Also, space has helped us learn about the moon and even Earth. I take the position that we should explore outer space instead of exploring underwater because eventually we will have to evacuate…
Are heroes always the ones with super powers? Do they always have to have laser vision? Are they always the ones with flying powers? Are they always the ones on TV, newspapers, and magazines? Many people believe that heroes have powers, but what they do not know is that they are average people all around society. They do little things that people take advantage of and do not get any recognition for it. Heroes do special things for people and many things to make the world better. Though leading…
Final Recordings of the Pegasus Expedition
”Foreign object spotted 56 N, 167,56 W.”
“What’s the depth reading, B?”
“A dip in the natural 2,000 meter mark— about 230 meters deeper.”
“Jones? The visual?”
“Nothin’ like I’ve seen before, and I doubt it’s natural. Sleek, white, and some dim lights glowing in a pattern along the side and rim.”
“Got that Bigelsteine?”
“Awesome. B, what’s the heat scan read?”
“No signs of life on the radar. However, the foreign vessel is recorded as over 80…
There you could never have enough energy to reach the speed of light. In 1905, Einstein, using his special theory of relativity showed that mass is actually just another form of energy and that in fact, they are equivalent. Equation E=mc2, (E=the energy released by an object in joules, m= the change in mass of an object in kg, c= the speed of light which is 3x108m.s-1.
Outline the discovery of the expansion of the Universe by Hubble, & its earlier prediction by Friedmann