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A little interesting about space life.

The Kuiper Belt, sometimes called the Edgeworth-Kuiper Belt, is a region located in our Solar System's outer limits beyond the realm of the eight major planets. It extends from the orbit of Neptune to approximately 50 AU. Neptune's average distance from our Sun is about 30.1 AU--its perihelion is 29.8 AU, while its aphelion is 30.4 AU.

and here is another

Kepler-22b sports an orbital period of approximately 200 days. Its inclination is about 90 degrees, and it transits in front of the face of its star as observed by Earth-based astronomers. The shape of Kepler-22b's orbit is unknown, but it is known that its average orbital distance is well within its parent star's habitable zone. Many extrasolar planets are known to sport highly elliptical (football-shaped) orbits, and if Kepler-22b also travels along such a path around its star, it would only spend a tiny fraction of its time within this Goldilocks zone. This would cause the planet to undergo such extreme variations in temperature that it would not be a pleasant place for delicate living things to evolve and flourish. Kepler-22b is approximately 2.4 times the radius of Earth.

and finally

"The distribution of these water-rich deposits is the key thing. They're spread across the surface, which tells us that the water found in the Apollo samples isn't a one-off. Lunar pyroclastics seem to be universally water-rich, which suggests the same may be true of the mantle," Dr. Milliken continued to explain in the Brown University Press Release.

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When a moon is in an orbit around its parent-planet, all is well--just as long as the gravity that is holding the moon together in one piece exceeds the powerful, relentless pull of its planet. Alas, if a moon wanders too close, and the tidal forces of the parent-planet exceed the gravitational bind of the unlucky moon, the moon will fall apart. This is termed the Roche limit. Earth's relatively large Moon is a very fortunate natural satellite, and the limit here is a bit under 10,000 kilometers--while our Moon is a safe 385,000 kilometers away from our planet.

Planetary scientists usually calculate the Moon's age by using the radioactive decay of elements like uranium, explained Dr. John Chambers in the April 2, 2014 National Geographic News. Dr. Chambers is a planetary scientist at the Carnegie Institution for Science in Washington, D.C. By studying an element with a recognized decay rate, and knowing its concentration in Moon rocks or the Earth's surface, scientists are able to calculate back in time to when the material first formed. However, there are numerous and varying radioactive materials that can provide differing timelines, added Dr. Chambers, who was not involved in the study.

There are more than 100 moons in orbit around the eight major planets of our Sun's family. Most of them are frozen worlds, primarily composed of ice with a smattering of rocky material, circling the four giant gaseous planets dwelling in the outer regions of our Solar System--Jupiter, Saturn, Uranus, and Neptune. The inner region of our Solar System is almost completely devoid of moons. Earth's own lovely Moon is the largest one in our inner region of the Sun's family. Of the four rocky and relatively petite inner worlds that circle nearest to our Star--Mercury, Venus, Earth, and Mars--Mercury and Venus are moonless, while Mars is orbited by two lumpy and misshapen small moons, Phobos and Deimos, that are most likely captured asteroids that originated in the Main Asteroid Belt that orbits our Sun between Mars and Jupiter.