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“One year ago, on Nov. 5, 2018, NASA’s Voyager 2 became only the second spacecraft in history to leave the heliosphere - the protective bubble of particles and magnetic fields created by our Sun. At a distance of about 11 …

“Planetary scientists prefer to call the thin gaseous envelope around the Moon as the ‘Lunar exosphere’ since it is so tenuous that the gas atoms very rarely collide with each other. While the Earth’s atmosphere near the mean sea …

“NASA’s Lunar Reconnaissance Orbiter has passed over the targeted landing site of India’s Vikram spacecraft a second time and again has been unable to spot the vehicle. The Vikram lander was part of India’s Chandrayaan 2 mission …

“A new selfie taken by NASA’s Curiosity Mars rover is breathtaking, but it’s especially meaningful for the mission’s team: Stitched together from 57 individual images taken by a camera on the end of Curiosity’s robotic arm …

“On mission day 10, Yutu 2 covered its shortest distance yet, but the rover seems to be performing well. China’s Chang’e 4 mission has completed 10 lunar days of activity on the far side of the moon, returning …

“For every action, there is a reaction: that is the principle on which all space rockets operate, blasting propellant in one direction to travel in the other. But one NASA engineer believes he could take us to the stars without …

“After successfully launching Thursday night, NASA’s Ionospheric Connection Explorer (ICON) spacecraft is in orbit for a first-of-its-kind mission to study a region of space where changes can disrupt communications and satellite orbits, and even increase radiation risks to astronauts …

“A team led by Carnegie’s Scott S. Sheppard has found 20 new moons orbiting Saturn. This brings the ringed planet’s total number of moons to 82, surpassing Jupiter, which has 79. The discovery was announced Monday by the …

“Japan’s asteroid mission has deployed its last rover to explore Ryugu’s rocky surface. The Hayabusa2 spacecraft has been exploring the asteroid since June 2018, and it deployed three other landers to the asteroid’s surface last fall. Then …

“Astronomers have spotted three giant black holes within a titanic collision of three galaxies. The unusual system was captured by several observatories, including three NASA space telescopes. “We were only looking for pairs of black holes at the time, and …