One of the biggest telescopes in the world is being tested to take its first peek at the Universe's hidden secrets.
The Great Canary telescope has taken seven years to build, on a mountain on La Palma in the Canary Islands.
It's not quite finished but is expected to be fully operational within the next year, when it will be able to spot some of the most distant objects in the sky.
The optical telescope's main mirror is a massive 10.4m wide and made up of 36 separate mirror segments.
Its size will mean it can catch some of the most far away light in the Universe which could help researchers find the secrets of star formation and hunt for other plants that are like Earth.