Astro Session 20 July 2018

Today, we had a talk on cosmology. I have learnt that cosmology is about the origin, evolution and fate of the universe.

Some theories of cosmology are the Big Bang Theory, Dark Matter theory, Hubble's Law and Cosmic Background Microwave Radiation. The scattering of light happens when electromagnetic radiation is forced to deviate from a straight trajectory due to the non-uniformities of the medium that they pass through. Rayleigh scattering is the scattering of light particles with radius 10x smaller than the wavelength of the light.

The electromagnetic spectrum is the longest wavelength of light can be as long as the Universe itself, while the shortest wavelength is theorised to be in the vicinity of the Planck Length. Different elements have different "energy-level" photons. This energy released is very specific for each element, like a signature. This light can be seen in an emission spectrum.

Redshift
Different colours in light have different wavelengths. Blue light has a short wavelength while red light has a longer wavelength.





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