The most widely accepted explanation for the origin and expansion of the universe is the ___ bang theory.
The theory suggests that there was a ___ (small) singularity that exploded.
The universe rapidly ___.
The universe was hot and dense and then begin producing elements such as hydrogen and helium as the universe ___ down.
The formation of new elements after the formation of galaxies and ___ gave way to the world as we know it.
It is theorized that all the matter and energy in the universe that expanded due to the initial burst is still ___ to this day.
Galaxies are getting ___ away from each other.
Hubble discovered that everything in the universe was moving ___ from each other and it started at a single point.
The Doppler effect is when objects give a higher frequency or ___ pitch sound as they move towards you due to the shorter wavelengths.
As an object moves away from you the sound waves become longer and make a ___ pitch due to the low frequency.
Objects in space moving towards an observer will show short, high frequency waves, creating a blue color. This is known as ___ shift.
Stars and galaxies are continuously expanding and therefore have a longer wavelength and are red in color. This is known as ___shift.
Red shift is used as evidence for the continued expansion of the universe and is used to support the theory that the universe is getting ___.
It is thought that the universe is ___ billion years old.
In 2 billion years the future of two spiral galaxies, Andromeda and our ____ ____, will hurtle toward each other at 250,000 mph, making Andromeda appear to grow larger.
In 4 billion years our ___ ___ and Andromeda will merge as one huge new elliptical galaxy of mature stars.
In 7 billion years the ___ ___ and Andromeda will merge as one huge new elliptical galaxy of mature stars.