Neptune

Neptune is the eighth and most distant planet in our solar system and is more than 30 times as far from the Sun as Earth. It is the only planet in our solar system not visible to the naked eye.

Neptune's atmosphere is made up mostly of hydrogen and helium, with just a little bit of methane, and the environment is not conducive to life as we know it. The temperatures, pressures, and materials that characterize this planet are most likely too extreme and volatile for organisms to adapt to.

Neptune has 16 known moons, with its largest moon being Triton. It also has at least five main rings and four prominent ring arcs that we know of so far. Starting near the planet and moving outward, the main rings are named Galle, Leverrier, Lassell, Arago, and Adams.

It takes sunlight 4 hours to travel from the Sun to Neptune.