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It is important to know at any age!

Triton was the second moon in our Solar System that was found to have a substantial atmosphere, which is primarily composed of nitrogen--with smaller quantities of carbon monoxide and methane. Discovered by William Lassell in 1846, only seventeen days after the discovery of Neptune, Triton is one of the most frigid worlds in our Solar System, with a surface temperature of only about 38 Kelvin. Triton's frozen surface is coated by nitrogen, carbon dioxide, methane, and water ices, and it has a high geometric albedo of more than 70%. Surface features include a large southern polar cap, ancient cratered planes that are cross-cut by scarps and graben, as well as much younger features thought to have been formed by endogenic processes like cryovolcanism (ice volcanoes).

and here is another

Although the moon appears to be changing according to the lunar phases, it is not literally changing. It was the amount of light it reflects that is constantly altering. The moon always remains the same and the light does not affect the shape of the moon, in any ways. In fact, it has has no power of light and it receives all the light from the Sun. Most people are unaware of this that they thought it is capable of glowing and beautifully bright. As a matter of fact, the moon is one mysterious yet very enchanting object.

and finally

The most detailed pictures of Europa show even more intriguing clues that there is slush lurking beneath its brightly shining icy surface. Slightly smaller than Earth's own beloved Moon, Europa's surface temperature could easily freeze an ocean solid over a span of only several million years. However, some astronomers think that warmth from a game of tidal tug-of-war between Europa and Jupiter, as well as other neighboring moons, could be keeping large regions of Europa's subsurface global ocean in a life-friendly liquid state. This process is termed tidal heating, and it refers to a mechanism whereby the gravitational tugs of a nearby object (or objects) flex and bend and contract and expand another object continually. This constant churning causes the victimized object, in this case Europa, to heat up and be considerably more balmy than its great distance from the Sun would otherwise allow it to be.

Other facts:

Images of Europa taken by Galileo in 1997 provide some important evidence suggesting that Europa may be slushy just beneath its glistening cracked icy crust--and possibly even warmer at greater depths. This evidence includes an oddly shallow impact crater, chunky-looking textured blocks of surface material that tantalizingly resemble icebergs on Earth, and openings in the surface where new icy crust appears to have formed between continent-sized plates of ice.

The most popular theory of lunar formation suggests that the Moon was born in a monumental collision between a Mars-size object named Theia and the ancient Earth--and that this ancient smash-up would have melted our primordial planet. This model further suggests that more than 40 percent of Earth's Moon is composed of the debris of the tragedy that was Theia. However, more recent theories indicate that our planet suffered from several giant collisions during its formation, with the lunar-forming crash being the last great grand finale event.

The efforts of planetary scientists to determine the lunar birthday have suggested a range of ages. Some have proposed an early event, about 30 million years after our Solar System formed, while others suggested that it occurred over 50 million years and perhaps as much as 100 million years after our Sun's family took shape.