Fast radio bursts were used as "cosmic weigh stations" to find the sparsely distributed matter.
Fixing problems on Voyager is a tricky business given that it is currently located around 11.5 billion miles from Earth.
NASA spacecraft recorded a jump in plasma density like Voyager 1 did on entering the interstellar medium in 2012.
The comet is only the second confirmed interstellar object to have passed through the solar system.
Japanese researchers propose new plan to hunt down our galaxy's "isolated black holes."
Study says odd characteristics of the cigar-shaped space rock can be explained through a host of natural phenomena.
"We [may] have at our fingertips the starting materials of planet formation from 4.6 billion years ago."
"It will truly be a historical mission to take our first step into interstellar space."
How do you design a spacesuit for a microscopic critter with eight legs?