The Universe - Science Language

Big Bang Theory
The theory that the universe originated between 10 and 20 billion years ago from the cataclysmic explosion of a small volume of matter at extremely high density and temperature.
Biosphere
The regions of the surface, atmosphere, and hydrosphere of the Earth occupied by living organisms.
Composition
Something's ingredients or constituents; the way in which a whole or mixture is made up.
Heavy Elements
Elements with atomic numbers higher than iron. They are formed by supernovae explosions.
Milky Way Galaxy
The galaxy containing the solar system; consists of millions of stars that can be seen as a diffuse band of light stretching across the night sky.
Nebular Theory
The theory that the solar and stellar systems were developed from a primeval nebula.
Scale
The size of something, especially as it compares to other things.
Solar System
The collection of eight planets and their moons in orbit around the sun, together with smaller bodies in the form of asteroids, meteoroids, and comets.