And last week mission scientists filed a flight plan for New Horizons' next flyby - of the Kuiper Belt object 2014 MU69 - in early 2019. It'll be farthest encounter yet between an earthly spacecraft and distant solar system body.
Milestones for Cassini's final week at Saturn. Today's distant flyby of the large moon Titan will slow down the spacecraft enough so that - on Friday - Cassini will make its final plunge into Saturn's atmosphere.
As we prepare to say goodbye to Cassini at Saturn - one of the longest-running and most awesome space missions ever - here's yet another first, a finely seen section of Saturn's inner-central B Ring, in natural color.
Too little UV light, and life might not ever start. Too much, in the form dramatic UV flares from stars, and the atmospheres of orbiting planets might undergo damage.
X-ray astronomers explored how quickly young stars settle down after blasting the space around themselves - including any possible planets - with energetic radiation.
This large asteroid swept closest to Earth on September 1. It's big enough that astronomers are still catching it in small telescopes, as a small, slow-moving “star.”
A new study shows house-sized NEOs - Near-Earth Objects - to be 10 times fewer than studies had indicated. Still, there are some 3.5 million NEOs larger than 10 meters across.