Our sun is just one galaxy star in the galaxy and ours is just one galaxy in the Universe
Outline the historical development of models of the Universe from the time of Aristotle to the time of Newton
Aristotle (approx. 350 BC)
His theory proposed: * Earth was round, rather than flat * Earth was the centre of the Universe and that the Sun, the Moon, and other visible planets, as well as a celestial sphere containing all the stars, revolved around the Earth, this model was known as a geocentric model (Earth in the centre)
Aristarchus (240 BC)
He has an alternative view; he suggested: * The Sun is much bigger than the Earth * The Sun is at the centre of the Universe and the Earth orbits it * The Earth …show more content…
* He used Einstein’s equations to determine his own solutions about the universe and when he omitted Einstein’s cosmological constant from his equations then all his solutions suggested that the universe was expanding * Hubble using the world’s largest telescope discovered the cosmological red shift. When light from distant stars and galaxies is examined with a spectroscope and compared to light from the same elements on Earth, the spectrum from the star or galaxy shows a shift towards the red end of the spectrum. * A red shift corresponds to a shift to the lower frequency (longer wavelength). This indicates that the light source, the galaxy is moving away from us. All galaxies show this effect indicating that the universe is expanding. The stretching of space causes the cosmological red shift.
Describe the transformation of radiation into matter which followed the ‘Big Bang’: * At the beginning of the big bang, there was only radiation. However over time ranging from 300 seconds to 1 million years, the particles combined to form atoms