Redshift- is observed light from other galaxies that suggests the universe is expanding.
Cosmic microwave background- is the thermal radiation left over from the time of recombination.
Elements in the universe-one of a class of substances that cannot be separated into simpler substances by chemical means.
Galactic evolution-concerned with the processes that formed a heterogeneous universe from a homogeneous beginning
Dalton's postulates-Matter is composed of very tiny or microscopic particles called "Atom". Atom can neither be created nor it is destroyed. Atoms of an element are identical in size, shape, mass and in other properties.
Rutherford's gold foil experiment-When he shot a beam of alpha particles at a sheet of gold foil, a few of the particles were deflected.
Bohr model of the atom-positively charged nucleus surrounded by electrons that travel in circular orbits around the nucleus
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