It takes some hubris to name a new project the Dark Energy Spectroscopic Instrument (DESI). I After all, dark energy is completely invisible – it gives off no light to be collected and analysed with a spectrograph. In fact, it's never been seen at all – it has evaded every attempt we've made to image or capture it with even our most advanced telescopes and detector experiments.
As far as we can tell, dark energy is something that is indiscernible, perfectly uniform throughout space and
