Vocab
All space and the matter space contains
What is the universe
The explosion of a massive star at the end of its life cycle
What is a supernova
The distribution of energy in wavelengths within a system
What is the spectrum
The lightest noble gas, containing two protons and two electrons
What is helium
A large grouping of stars, planets, gas, and dust in space held together by gravity
What is the galaxy
A theory that says the universe began as a small point that expanded rapidly about 13.7 billion years ago
What is the big bang theory
An element containing one proton and one electron that is a colorless, odorless, highly flammable gas when found in nature
What is hydrogen
A reaction in which two light nuclei combine to produce a nucleus of heavier mass, resulting in the release of a large amount of energy
What is nuclear fusion
A unit of length equal to the distance that light travels through space in one year
What is a light year
The change in wavelength that allows us to determine if an object is moving toward us or away from us
What is redshift and blueshift
One of the primary substances that make up matter and cannot be chemically broken down or converted into other substances; defined by the atomic number
What is a element
The tiny, very dense, positively charged region in the center of an atom; made up of protons and neutrons
What is a atomic nucleus
A pervasive radiation, also known as cosmic microwave background, seen in every direction that is evidence of the big bang theory
What is primordial radiation
The specific wavelengths of electromagnetic radiation emitted by the electrons of atoms or molecules as those electrons return to a lower and more stable energy state
What is the emission spectra