Signs and portents gentlemen, Signs and PortentsA mysterious giant hexagon lies above Saturn's north pole, captured by cameras on Nasa's Cassini Orbiter. Spanning 25,000km - equivalent to the width of two planet Earths - the bizarre geometric feature appears to remain virtually still in the atmosphere as clouds swirl around it.
Let the "2001, a space odyssey" references ensue.
The infra-red images show the hexagon - which contains a smaller six-sided formation - extends about 60km down into the clouds.