Universe Fundamentals
Our Universe is all of time and space and its contents. It includes planets, moons, minor planets, stars, galaxies, black holes, the contents of intergalactic space, and all matter and energy. After the initial expansion, the Universe cooled, allowing the first subatomic particles to form and then simple atoms. Giant clouds later merged through gravity to form galaxies, stars, and everything else we see today.
Actinoids
Alkali Metals
Alkaline Earth Metals
Halogens
Lanthanoids
Metalloids
Noble Gases
Nonmetals
Post-transition Metals
Transition Metals
All Groups
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