Rings and aurorae

"The newly discovered outer ring of Uranus is bright blue for the same reason the Earth's sky is blue -- it is made up of tiny particles, astronomers said on Thursday.

"It is 'strikingly similar' to Saturn's outer ring, which astronomers last month confirmed was probably generated by one of the planet's moons, Enceladus."

Speaking of Saturn...

"N00056284.jpg was taken on April 04, 2006 and received on Earth April 06, 2006.
The camera was pointing toward [Saturn's moon] Methone."

And finally...

"The interplanetary magnetic field (IMF) tilted south on April 5th, opening a crack in Earth's magnetic defenses. Solar wind flowed in and sparked an unexpected display of auroras."