Southwest Research Institute

Juno spacecraft by Nasa set to make fifth flyby over the cloudtops of Jupiter

At the closest approach, Juno will be 4,400 km above the planet's cloud tops, moving at a speed of 57.8 km per second relative to the gas-giant planet.

Space around Pluto nearly dust free: NASA's New Horizons spacecraft

Space environment around Pluto and its moons is almost empty, containing only about six dust particles per cubic mile, according to data collected by a student-built instrument riding on NASA's New Horizons spacecraft.