Part 3/11:
The JWST can detect longer wavelength or infrared light, allowing us to peer deeper into space and time, revealing the formation of the earliest galaxies—an undertaking previously unobtainable with earlier technologies. Cox noted the phenomenon where light from a distant galaxy, such as the Andromeda galaxy, takes millions of years to reach us, meaning that observing it equates to watching the universe as it existed millennia ago. The JWST aims to look back over 13 billion years, providing insights almost to the universe's inception.
Probing the Big Bang and Beyond