Black Holes

Topics: Dark matter, Sun, Mass Pages: 3 (1125 words) Published: April 2, 2013
Black Holes
Black holes intrigue many. They consist of a great amount of matter smashed into a small area. There are actually two types of black holes: stellar black holes and massive black holes. Stellar black holes have masses up to ten times the mass of the sun and massive black holes have masses up to a billion times the mass of the sun. Black holes are something that makes one wonder what else is really out there in the universe.

Massive black holes are more popular than stellar black holes because of their sheer size and mass. According to an article published in Science, M. Volonteri says that massive black holes have masses anywhere from tens of millions to a few billion. The smallest known black hole consists of only a few hundred thousand times the mass of the sun (544). This solidifies the fact that there are significant differences between stellar black holes and massive black holes.

In a different article published in Science, A.C. Fabian and J.M. Miller discuss how black holes can be forms of radiation. They agree that during accretion of matter, large amounts of energy are released as gas spirals into the hole. They also mention that a component of the emission can provide great insight into the middle of stellar black holes (947). They explain how a broad peak caused by thermal emission dominates the emission spectrum. Black holes put off emissions that create radiation and they also generate a lot of heat.

Black holes formed from the same materials that galaxies and the rest of the universe did. Stars and gas represent most of the galaxy’s make up. They can form in a couple different ways according to Fig. 1 in Volonteri’s article. Black holes start out as dark matter surrounded by gas. They proceed depending on how fast the gas cools. If it cools slowly, then stars begin to form. If it becomes to many stars, it collapses into a black hole that is about 200 times the mass of the sun. If the gas moves towards the center of the dark matter,...

Cited: Fabian, A.C. and Miller, J.M. “Black Holes Reveal Their Innermost Secrets.” Science
News. 9 Aug. 2002. Exlibrisgroup.com. Web. 21 Jan. 2013
Volonteri, M. “The Formation and Evolution of Massive Black Holes.” Science News 3
Aug. 2012. Exlibrisgroup.com. Web. 21 Jan. 2013.
A summary of A.C. Fabian and J.M. Miller, “Black Holes Reveal Their Innermost Secrets,” Science News, 9 Aug 2002.
According to Science News journalists A.C. Fabian and J.M. Miller’s article that appeared in the August 2002 edition of the magazine, black holes create a large amount of radiation. They also create high amounts of gravitational energy because gas spirals through the center of the hole. Various things in the galaxies can affect the amounts of emissions that black holes actually make. The size of the hole also depends because if a one hole is larger than another, the larger hole will create more gravitational energy and more radiation than a smaller hole. They conclude by discussing how further tests promise to develop more revelations about stellar black holes, which are the smaller of the two between massive black holes and stellar black holes.
The authors are effective by using a credible journal article in Science News to reach out to their desired audience. Scholars, scientists and educated people would be likely to read this particular magazine. The purpose of this text was to inform the reader about radiation and emissions caused by the different types of black holes. The authors were successful in informing the reader due to the fact that they have credible sources along with facts and images to back up the evidence used. The authors are strictly at an informative stance on this issue because all they are trying to do is inform the reader. The authors also do a great job setting up the article because it is broken up nicely by the images inserted to support evidence.
A summary of M. Volonteri, “The Formation and Evolution of Massive Black Holes,” Science News, 3 Aug 2012.
According to Science News writer M. Volonteri’s article that appeared in the August 2012 edition of the magazine, there are two types of black holes that have different amounts of mass. Stellar black holes have a mass that is only a few hundred thousand times the mass of the sun while massive black holes have a mass that can be up to a billion times the mass of the sun. He also discusses how black holes form in which they form similar to the way a galaxy forms. They start as matter surrounded by gas and depending what the gas does, it forms a black hole. He then discusses possible trends between different galaxies developing along with black holes and what black holes can do for a galaxy.
The author is effective by using a credible journal article in Science News to reach out to their desired audience. Scholars, scientists and educated people would be likely to read this particular magazine. The purpose of this text was to inform the reader about the different types of black holes, along with how the form and what they can do for a galaxy. The author was successful in informing the reader due to the fact that they have credible sources along with facts and images to back up the evidence used. The author is strictly at an informative stance on this issue because all they are trying to do is inform the reader and they never state an opinion. The author also does a great job setting up the article because it is broken up nicely by headings and images to support the text.
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