Light acts like a wave and a particle

Light "redshifts", or increases its wavelength, as it travels long distances

The speed of light is the fastest possible speed in the universe

The speed of light can only be achieved by massless objects

Photons are without mass, therefore can go at the speed of light

Where most waves carry energy in their amplitude, light carries it instead in its frequency

Radio waves are the weakest type of light

Microwaves are found everywhere as cosmic background radiation

Infrared waves are felt as heat

Visible waves are the only waves we can see

Ultraviolet is harmful to the skin, and can cause skin cancers

X-rays are so high energy that they pass through most objects without being absorbed

Gamma rays are the highest energy type of light and can do a lot of damage

Atoms that absorb photons are excited

The spinning of electrons around atoms produces electromagnetic waves

The electromagnetic waves produced by spinning electrons are basically light