2.6 review Juliana pettley

The big bang theory: The universe began as a violent expansion. All matter and space was created from a single point of pure energy. The universe was born more then 13.7 billion years ago.
Red shift is the displacement of spectral lines tword longer wavelengths in radiation from distant galaxies in celestial objects.
The CMB is the thermal radiation left over from the time of recombination in the big bang cosmotology
Elements in the universe is the abundance of chemicals. Hydrogen is the most abundant element in the universe.
Galactic evolution is the study of galaxy formation and evolution.
Models of an atom:
The main postulates of Dalton's atomic theory: Matter is composed of tiny particles called an atom.
Thompson proposed that the atom is composed of electrons surrounded by a soup of positive charge to balance the electrons' negative charges
Ruthford's gold foil experiment was one of the most important discoveries. It proved the existence of a small massive center to atoms.
Bhor model depicts the atom as a small, positively charged nucleus surrounded by electrons that travel in circular motions around it.

Credits:

Created with images by rmforall@gmail.com - "#91 astrodeep200407aab10aa.png 4.12 MB 1244X1243 HUDF top center NASA original" • NASA Goddard Photo and Video - "Mars Transition" • quapan - "black square sun hypeЯReally eclipsed through layers of social housing blocks" • rmforall@gmail.com - "#30. astrodeep200407aecc" • minniemouseaunt - "Flower" • R_grandmorin - "evolution" • Dun.can - "City Lights #1" • NASA Earth Observatory - "Re-entry of Progress Spacecraft 42P" • Hans - "symbol metal characters" • aπ - "Solitude at the horizon" • Hubble Space Telescope / ESA - "Hubble’s colourful view of the Universe"

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