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A little interesting about space life.
Like Earth's own large Moon, Triton is locked in synchronous rotation with its planet--one side always faces Neptune. However, because of Neptune's odd orbital inclination, both of the moon's polar regions take turns facing the Sun. Spacecraft images of Triton reveal mounds and round pits formed from icy lava flows (cryovolanism), as well as smooth volcanic plains. The surface of the moon is only sparsely cratered, indicating that its surface is new--that is, it is constantly being resurfaced, probably by the "lava" flow from icy volcanoes. Triton is very bright--its fresh, sparkling, new ice-coating is believed to cover a heart of metal and rock. Triton's high density suggests that it contains more rock in its interior than the icy moons of Saturn and Uranus.
and here is another
Europa, an icy little moon that circles the giant planet Jupiter, probably sustains a global ocean of liquid water beneath a tortured, shattered icy crust. For a long time, weird and jumbled regions of ice disruption, called "chaos terrains", were seen only on Europa, and their origins remained cloaked in mystery. But astronomers now think that the "chaos terrains" formed as the result of a subsurface liquid saltwater lake, equal to all of the Great Lakes on Earth combined. Hidden about 1.9 miles beneath Europa's cracked eggshell-like frozen crust, the ice-embedded lake may be one of the latest potentially habitable environments discovered so far in our Solar System.
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.
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Over the passage of billions of years, this ceaseless rain of falling objects have pulverized the lunar surface, creating fragments ranging in size from a fine powder to enormous, heavy boulders. Almost the entire lunar surface is literally blanketed by a pile of ground up rubble composed of charcoal gray, powdery dust and rocky debris collectively termed the lunar regolith. Beneath the regolith there is a region composed of shattered bedrock that is called the megaregolith.
The first observations of Mars as an object traveling in Earth's night sky was recorded by the ancient Egyptian astronomers, and by 1534 BCE the ancient astronomers were familiar with the retrograde movement of the planet. By the time of the Neo-Babylonian Empire, the Babylonian astronomers were making regular records of the positions of the planets, as well as systematic detections of their behavior. In the case of Mars, the ancient astronomers realized that it made 42 circuits of the zodiac every 79 years. These scientists of long ago even invented arithmetic methods so that they could make minor corrections pertaining to the predicted positions of the planets inhabiting our Solar System. The ancient astronomers referred to the planets as "wandering stars".
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.