This work questions our relationship to time and cosmic phenomena that occur on scales in space and time far beyond human perception. In UNRESOLVED SUN / SOLEIL IRRÉSOLU, these phenomena are made tangible by a thin disc of green fluorescent liquid inhabited by mobile and ephemeral vibrations, in an unusual visual and sound landscape. Thanks to a complex optical device and precise adjustment, the light that passes through the layer is projected onto the adjacent wall in the form of a large orange disc deformed by storms. The space deployed in the imagination results more from music than from choreography. The small green fluorescent disc and the large projection then behave like a sound material composed of textures and rhythms. The sonic material is derived from the real and historical astrophysical observation of the crab Pulsar, a remnant neutron star of the gigantic explosion of a supernova never reported, the first object in space observed with a radio telescope to pulse at audible frequency. CCS CONCEPTS Fine arts; media arts; sound and music computing.