NASA spots a new comet flying in from a distant star system
The newly discovered interstellar visitor is just the third of its kind and fascinates astronomers who hope to learn from it about galaxies far, far away.
comets
Leonard is the brightest comet all year. Here's how to see it
The comet was discovered less than a year ago near the orbit of Jupiter. Now, observers in North America can see it in the northeastern sky around sunrise.
Mars Probes Give Scientists Box Seats For Rare Comet Flyby
A "mountain-sized" comet known as Siding Spring will pass very close to the red planet, where orbiters from the U.S., Europe and India, hope to get close — but not too close — to the action.