Among the objects of the Solar System, Pluto is much less massive than the terrestrial planets, and at less than 0.2 lunar masses, it is also less massive than seven moons: Ganymede, Titan, Callisto, Io, the Moon, Europa and Triton.
"The players are definitely much more massive and that's one factor.
They were everywhere, and so much more massive than everything else.
If the star is much more massive than the Sun, it will explode violently, giving rise to a supernova.
The puny little companion was nicknamed the Pup – but this had once been a star much more massive than Sirius.
"We have to take much more massive action than we have up until now," he told Israel Radio.
Earth and the other planets of the inner solar system, however, are much less massive, and most have hotter upper atmospheres.
Beta rays are much less massive negatively charged particles; they were shown to be the same as the electrons discovered by J.J. Thomson in cathode rays in 1897.
Under these conditions, Titan, which is the much more massive body, gives Hyperion periodic gravitational nudges that force it into a relatively eccentric orbit.
