Does Light Lose Energy As It Travels The Universe?

As a wave of light travels through the universe, does it lose energy? For example, what is the wavelength of 450 nm (blue) light after traveling a trillion (1,000,000,000,000) km in the universe? Thank you very much.
The anisotropies of the Cosmic microwave background (CMB) as observed by Planck. The CMB is a snapshot of the oldest light in our Universe, imprinted on the sky when the Universe was just 380,000 years old. Image credit: ESA/Planck Collaboration, CC BY SA IGO

The anisotropies of the Cosmic microwave background (CMB) as observed by Planck. The CMB is a snapshot of the oldest light in our Universe, imprinted on the sky when the Universe was just 380,000 years old. Image credit: ESA/Planck Collaboration, CC BY SA IGO

It does! This loss of energy is usually officially termed a cosmological redshift, and it’s an interesting combination of the way that light moves through space, and the nature of our Universe’s expansion. Light behaves both...

Read the full article at Forbes!

Have your own question? Feel free to ask! Or submit your questions via the sidebarFacebook, or twitter.

Sign up for the mailing list for updates & news straight to your inbox!