A mystery interstellar object discovered last week is likely to be the oldest comet ever seen—possibly predating our solar ...

Rosetta’s Comet Has a Shiny Necklace New pictures show a bright “neck” where the comet’s two pieces join. Tony Reichhardt . July 24, 2014. Get our newsletter! Get our newsletter!

The periods of comet bombardment also coincide with mass extinctions, such as that of the dinosaurs 65 million years ago. Our present position in the galaxy suggests we are now very close to ...

The comet and galaxy are still relatively close to each other in the sky, but since the comet’s on the move that won’t last long. Sky and Telescope has a how-to on viewing.