TLDR: Yes, Yes, Yes Infra-red is good for finding some spectral lines, and finding the temperature of exo-planets which can be useful when looking for extra-te

TLDR: Yes, Yes, Yes Infra-red is good for finding some spectral lines, and finding the temperature of exo-planets which can be useful when looking for extra-terrestrial life. It also lets us look further back in time and through dust clouds. Early universe observations provide useful info about dark matter possibilities.