What's Inside a Planet?
Mercury has an average density of 5,430 kilograms per cubic ... Average planet density is 2,060 kilograms per cubic meter. The low average density requires that the planet must be a mix of ice and rock.
Gravity on Other Planets
A gas giant, Saturn is more massive than Earth, but it also has the lowest density of all the planets in the Solar System. If you were able to stand on Saturn’s surface, you would experience about 91% of the gravity you would on Earth. Like Saturn ...
The Future of Energy: Why Power Density Matters
Currently the planet consumes energy at a rate of over 16 TW (16 ... density versus energy use density in this lower consumption America: Low density Phoenix perhaps has a shot at getting most of its energy from solar power. Covering 25% of Phoenix in ...
Astronomers Find a Huge Rocky Planet: A "Mega Earth"
In this case, astronomers have discovered that a nearby star has a kind of planet never before seen: a “mega Earth,” a rocky planet far larger ... If that were the case, then you’d expect its density to be low, since gas giants like that, which ...
Five New Planets Found; Hotter Than Molten Lava
is among the lowest-density planets yet found, with about the same density as Styrofoam, he said. (Related: "'Backward' Planet Has Density of Foam Coffee Cups.") These planets are "certainly no place to look for life—that will be coming later," with ...