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Interesting facts about space.

Pluto itself is a relatively large denizen of the distant Kuiper Belt, that orbits our Sun in the frigid company of a vast multitude of other bewitching and mysterious icy objects. Like other Kuiper Belt Objects (KBOs), Pluto is thought to be composed primarily of ice and rock. It is an intriguing frozen "oddball", a mere 1/6 the mass of Earth's own Moon and 1/3 its volume. Pluto also has a highly inclined, eccentric orbit that carries it from 30 to 49 Astronomical Units (AU) from our Sun. One AU is equal to the mean Earth-Sun separation of 93,000,000 miles. As a result, Pluto periodically moves towards our Sun at a distance that is closer to our Star than Neptune. Very fortunately for both Neptune and Pluto, an orbital resonance with Neptune prevents the duo from crashing into each other.

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 team also considered whether it would be possible to determine, with an adequate degree of certainty, if a detected moon could bear life-loving liquid water. In their analysis, the "input" climate for the moon is habitable, which is identified with high probability. However, there still remains approximately a one in six failure rate.

Other facts:

Mystifying, bewitching, and swathed in a heavy, dense shroud of orange hydrocarbon mist, Titan circles its immense gas-giant parent-planet, Saturn, and is a remarkable world in its own right. Slashed by strange rivers and seas of ethane, methane, and propane, and pelted by large and lazy drops of hydrocarbon rain, Titan is an eerie, tormented, and mysterious moon-world orbiting its magnificent and beautiful ringed parent-planet, in the distant outer realm of the giants--Jupiter, Saturn, Uranus, and Neptune. The four enormous and gaseous wonderland worlds are unlike the quartet of much smaller rocky denizens of the inner Solar System--Mercury, Venus, Earth, and Mars. Because of its dense orange blanket of smog, the geological features of Titan's surface were hidden from the prying eyes of curious astronomers until 2004 when the Cassini/Huygens orbiter and lander finally arrived there--and started to unveil its long-hidden face. In April 2016, a team of planetary scientists announced yet another important revelation about this moon-world--a large sea on Titan is composed primarily of pure liquid methane, with the seabed itself possibly well-coated in a sludge of carbon-and nitrogen-rich material, as well as showing strange shores surrounded by wetlands.

"The key question is whether those Apollo samples represent the bulk conditions of the lunar interior or instead represent unusual or perhaps anomalous water-rich regions within an otherwise 'dry' mantle. By looking at the orbital data, we can examine the large pyroclastic deposits on the Moon that were never sampled by the Apollo or Luna missions. The fact that nearly all of them exhibit signatures of water suggests that the Apollo samples are not anomalous, so it may be that the bulk interior of the Moon is wet," explained Dr. Ralph Milliken in a July 24, 2017 Brown University Press Release. Dr. Milliken is the lead author of the new research and an associate professor in Brown University's Department of Earth, Environmental and Planetary Sciences. Brown University is in Providence, Rhode Island.

Dozens of crewless spacecraft, including landers, rovers, and orbiters, have been dispatched to Mars by the Soviet Union, the United States, Europe, and India to observe the planet's climate, surface, and geology. Since the year 2000, cameras circling in orbit around Mars have sent back to Earth a treasure chest overflowing with revealing pictures of the "fire star." These wonderful images have displayed a Martian surface etched with small valleys and carved into slopes. These features are eerily similar in their shape to gullies carved by gushing water flowing on Earth. The Martian gullies are believed to be less than a few million years old--a tiny wink of the eye on geological time scales. In fact, some of the gullies even appear to be younger than that! These detections are enticing. This is because the observations hint to planetary scientists that great quantities of liquid water may still be lingering on Mars at present--and that this gushing water might be what carved out the gullies.