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Have been successful in observing this accumulation-spinning disk on radio, x-ray, and gamma ray bands since emissions of black holes often become very warm and thus, come on the x-ray bands (Susskind & Lindesay, 2004). With these observations, a huge number of scientists have now proofs of real black hole at the core of Milky Way galaxy that is heavier than the four million solar masses, and it is assumed that this black hole has maintained its gravitational field and absorbing everything that comes in its vicinity.Due to this ability of black holes to soak up everything in its reach, black holes continue to expand and change their sizes. Scientists believe that besides gas, black holes easily soak up interstellar particles within their reach that subsequently results in a heavier black hole, which has become a characteristic to differentiate various type of black holes (Melia, 2003). Particularly, analysis has indicated three major characteristics that differentiate black holes from each other despite their identical existence in the space: mass of the black hole, spin angle and speed, and its electric charge (Melia, 2003).Scientists do not have the tools to observe and inspect black holes; however, they have found an alternative way to measure mass of these holes by analyzing particles that are orbiting the holes, which allows the scientists to calculate estimated mass of the black holes. Based on this mass calculation, stellar-mass and super-massive are two basic types of the black holes (Raine & Edwin, 2010) where stellar-mass is a type that is little heavier than the Sun, whereas, super-massive black holes are objects heavier than the entire galaxy.Scientists have come up with various other types for black holes that fall in between the two mass categories, however, stellar-mass and super-massive types enjoy most of the significance. Besides, different scientific bodies have further divided these two types based on the spin axis of particular black holes that help determine their rotation speed; however, there are still contradictions among this assumption of black holes being in rotation. Few scientists argue that all the black holes rotate since stars are the former bodies of black holes, and all the stars rotate, and thus, all the black holes, which has not been an accepted theory for many.Although it is assumed that black holes soak up everything coming in their reach and which resulted in their name, still, scientists believe that

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Kaper, L. and Woudt, P. A. (2001). Black Holes in Binaries and Galactic Nuclei. Springer.

Melia, F. (2003). The Black Hole at the Center of Our Galaxy. Princeton University Press.

Melia, F. (2003). The Edge of Infinity: Supermassive Black Holes in the Universe. Cambridge University Press.

Raine, D. and Edwin, T. (2010). Black Holes: An Introduction. Imperial College Press.

Susskind, L. and Lindesay, J. (2004). An Introduction to Black Holes, Information and the String Theory Revolution: The Holographic Universe. World Scientific Publishing Company.

Taylor, E. F. and Wheeler, J. A. (2000). Exploring Black Holes: Introduction to General Relativity. Addison Wesley Longman.

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