These are photos from Cassini spacecraft's set of 'Grand Finale' manoeuvres around Saturn - this article has a good summary http://www.abc.net.au/news/2017-04-28/cassini-sends-back-clo...

The images from the initial link are the newest raw images taken during the flyby which happened about two days before. Possibly the closest images ever taken of Saturn.

Google did a great doodle too https://www.google.com/doodles/cassini-spacecraft-dives-betw...