The cosmic microwave background (CMB) gives us information about the earliest history of
the Universe, close after the Big Bang. After half a century of more and more sensitive
CMB observations, from ground, space and balloons, we now have dozens of valuable data
sets available. Each of these has their own strengths and weaknesses, including
sensitivity, resolution, frequency bands, sky fraction and systematics. Traditionally
each experiment has been analyzed separately, which means that one is blind to the modes
not observed by that particular instrument. When instead analyzing them jointly, they
will break each other's degeneracies. Another benefit of joint analysis is that more
data allows you to model and constrain the CMB and the foreground emissions from our own
galaxy at the same time, which is needed to separate the different components and get
the best constraint for the cosmological parameters. We are currently in the process of
integrating DIRBE measurements between 1.25 and 240 µm into the same model, and thereby
build a single sky model from radio to near-infrared frequencies. The long-term goal of
Cosmoglobe is to extend this type of analysis to cover the entire electromagnetic
spectrum.