Sentences with phrase «only planetary satellite»
The largest of Jupiter's 39 moons and the largest moon in the solar system, Ganymede is the only planetary satellite known to have patches of grooved terrain that resemble formations on Earth.
http://discovermagazine.com/ Not exact matches
Planetary scientists are intrigued that Pluto, which is only 2,300 km across, has so many satellites - and of course there could be more even smaller, yet undiscovered.
The only thing I would add is when it comes to building satellites there is an efficiency / benefit that comes from having the spacecraft development infrastructure for Earth observations in the same organization that builds spacecraft for other purposes — planetary and astrophysics.