The Universe we see in a clear night sky looks astonishing: so beautiful, rich and full of structures such as stars, gas clouds, galaxies, clusters... Yet, it is a tiny fraction of what actually exists out there: around 4%, as many astronomical and cosmological observations in recent years have established. What makes up the rest? Unknown particles dubbed Dark Matter (DM) and an even more mysterious substance dubbed Dark Energy (DE).

Discovering what they really are is the challenge in front of us for the next decades. Thousands of physicists, astronomers and cosmologists spend days and nights trying to detect one of those DM particles in underground experiments shielded by entire mountains, or trying to identify their subtle traces in cosmic rays using devices on board of the Space Station or even trying to produce some of them directly in the Large Hadron Collider of CERN.

Thousands others struggle to constrain the nature of this 'fluid' DE and to make sense of the mathematical infinities that it would imply in our current theories.

This talk will be a quick journey through the physical evidences of DM and DE, their main features and the huge experimental and theoretical efforts they spur.