Thanks to a larger mirror and other capabilities, JWST will “see” early days of the universe that Hubble never could. Discover more about it from our latest story below.
Light from space always reaches us after a delay. For example, the light from our nearest star system, Alpha Centauri, takes four years to reach Earth, so when we look at Alpha Centauri, we see it as it was four years ago.
The particles from the Big Bang grouped together due to gravity and formed the first atoms. Those atoms grouped together in clumps, eventually becoming stars. When the first stars formed they also began to emit the first light, which JWST was built to detect. By comparison, JWST is designed to collect infrared radiation, thanks to its much larger 21-foot diameter mirror. There are other benefits in collecting infrared radiation besides viewing faraway objects. Stars and planets that are just forming are surrounded by dust, which absorbs visible light; however, infrared radiation can penetrate that dust. Thus, JWST can see both farther and fainter objects than Hubble ever could.
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