Basically, you can say that we’ll get a more high-quality, HD picture. The word Infrared basically means below red. This word comes from Latin, Infra means below. So Infrared literally means Below Red. Because its frequency lies below that of red. And frequency is inversely proportional to wavelength. You’ll recall this. Anything that radiates heat, emits infrared waves.
Humans, animals, the Sun, fire each of these emits infrared waves. That’s why in night goggles, you would’ve seen soldiers use night goggles often, they basically detect infrared. It is captured by infrared cameras. Since the telescope will look at stars and galaxies of stars, and planets, all of which radiate heat, it’ll be possible to capture and look at the infrared waves.
The other advantage of infrared is that when a telescope looks at stars at such a distance, stars that are billions of kilometres far from us, when the light from those stars reaches the telescope, the light has travelled such a distance, that by the time it reaches here, and as we know the universe is slowly expanding, the wavelength of the light gets stretched. The wavelength gets elongated. This phenomenon is known as the Red Shift. That the wavelength of the light has stretched a bit, and has shifted towards the colour red.
