The Planck satellite’s picture of the infant universe gets its last tweaks
From 2009 to 2013, the craft observed the oldest light in the cosmos
![cosmic microwave](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2018/07/072018_EC_planck_feat.jpg?fit=860%2C460&ssl=1)
TAKE A BOW It’s the cosmic finale for the Planck satellite, which measured the oldest light in the universe, the cosmic microwave background (shown).
ESA, Planck Collaboration