A rocket is a vehicle that propels itself through space by ejecting a propellant gas at high speed in a direction opposite the desired direction of motion. The largest and most powerful rocket ever bu...A rocket is a vehicle that propels itself through space by ejecting a propellant gas at high speed in a direction opposite the desired direction of motion. The largest and most powerful rocket ever built is the United States Saturn V Moon rocket, which took the Apollo astronauts to the Moon in the 1960s and 1970s. As we'll see here, such arguments are silly—one needs only to make use of the conservation of momentum to show that rockets can work in space.
The least dense planet is Saturn, with a density of 0.687 g/cm 3 . Saturn is the only planet in the Solar System that would float on water (given a large enough ocean). If the star is large enough, gr...The least dense planet is Saturn, with a density of 0.687 g/cm 3 . Saturn is the only planet in the Solar System that would float on water (given a large enough ocean). If the star is large enough, gravity can be strong enough to push the electrons of the atoms into the nucleus, forming a “neutron star”, which is essentially a giant ball of neutrons.
