Essay, Research Paper

Kristy Pryzmont

May 5th, 2001

Astronomy HWK # 4

ASTR220

1. There is grounds that supports the hypothesis that the Milky Way Galaxy has a monolithic black hole at its nucleus. At the centre of our really ain galaxy is a cryptic beginning of energy. Huge sums of radiation pour from this compact beginning which may be a Supermassive Black Hole. Astronomers found an intense wireless beginning with strings of other wireless beginnings clustered about it in the way of the galactic centre. The intense beginning was named Sagittarius A because the centre of the galaxy lies in the way of the configuration Sagittarius. The place of Sagittarius A as has been observed through wireless telescopes around the universe seems to be really near the dynamical and gravitative centre of the galaxy. Based on its high brightness and wireless spectrum Sagittarius A is neither a star nor a pulsar. It has a brightness of 5 stars but is smaller than our solar system. Besides, it can & # 8217 ; t be a supernova leftover since it is non spread outing. The strongest grounds that it is a Supermassive Black Hole comes from Doppler displacement of ionised gas in its locality. Their ascertained velocities, every bit high as 300 km/s, can be explained as an orbital and coiling gesture around the centre. Therefore, a beginning of gravitation is required to keep these high-velocity gases in orbit. Such a monolithic object, this compact, can merely be a Supermassive Black Hole.

2. On the web site, there is much clear grounds of a black hole in the cardinal part of the Virgo bunch galaxy M 87. The first image shows a coiling shaped hot gas at the nucleus of our active galaxy. The gas is revolving so quickly that there must be a black hole at the centre. The part M 87 fits the description of a black hole. It weights every bit much as three billion Suns, but is concentrated into a infinite no larger than our solar system. This strong gravitative pull towards the centre is clear grounds of a black hole. Besides, a jet of high-speed negatrons which are emitted from the karyon are predicted to b

vitamin E produced by the black hole “engine” . In the 2nd image, they measured the visible radiation from the phonograph record and studied when it was red-shifted and blue-shifted. The gas on the side that is whirling off from the Earth is traveling 1.2 million stat mis per hr. The gas on the opposite side that is traveling towards the Earth is traveling in the same way. These high speeds are clear grounds that there is a strong gravitative pull towards the centre of our galaxy. Besides, since it is a black hole, non even light can get away its highly strong gravitative pull.

3. On the web site, I saw images of galaxies clashing. NASA & # 8217 ; s Hubble Space Telescope has uncovered two galaxies clashing. It was described as & # 8220 ; more than 1,000 bright, immature star bunchs spliting to life in a brief but intense pyrotechnics show & # 8221 ; . The images besides provide grounds of what would go on if two galaxies were to crash into each other. They support the theory that if two coiling galaxies were to clash into each other, the consequence is an egg-shaped galaxy with far more stars that either of the original galaxies and besides including many star bunchs. The Hubble images were merely able to see the brightest bunchs of stars created by the clang. The exposure besides tell scientists what would go on if a hit between our galaxy and the Andromeda galaxy, which is supposed to go on in several billion old ages and change both of the systems. The two galaxies are shuting in on each other at a velocity of 300,000 stat mis per hr. The Andromeda is 2.2 million light old ages off and the hit should go on no sooner than 5 billion old ages in the hereafter. This may be when our Sun burns up which at the point would cut down Earth to a ball of stone. The clang besides would non happen spontaneously but would take several billion old ages to run its class. During this processes, molecular H clouds will compact and detonate, organizing 1000s of new star bunchs. The gravitative pull between the two galaxies would do them to organize an egg-shaped galaxy with many new stars.

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