Atom & Cosmos

When Jupiter aligns with Mars’ moon, plus a salty Saturnian moon and an eye-catching comet in this week’s news

Salty geysers on Enceladus
A spectacular plume spewing from Saturn’s moon Enceladus turns out to be full of salt. Chemistry instruments aboard the Cassini spacecraft analyzed the plume and found it to contain as much as 99 percent salt-rich ice particles.