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A little interesting about space life.
The sunlight that penetrates through the transparent crust helps the growth of vegetation in the caves to a substantial extent. However sunlight is not the main light source in the caves. The types of vegetation found in the moon are markedly different from the ones on earth. The plants commonly seen in the caves are quite short and look very much like the miniature trees, bushes and shrubs grown using Japanese "Bonsai" techniques.
and here is another
Banded, beautiful, and a bewitching sapphire blue, the ice-giant planet Neptune is the most distant major planet from our Star--and it is also circled by a bizarre large moon that may not have been born a moon at all. Neptune's moon, Triton, may really be an uninvited guest--the alien changeling child, taken in from the cold, by its current parent-planet, Neptune. Triton shows features that hauntingly resemble those seen on the dwarf planet Pluto, an icy denizen of the remote Kuiper Belt. The Kuiper Belt is a reservoir of a multitude of sparkling icy comet nuclei, as well as other frozen bodies--some large, some small--situated in a ring around our Sun beyond Neptune's orbit. Triton and Pluto share roughly the same density and bulk composition, as well as similar atmospheres--and they both travel in unusual orbits. Also, Neptune's system of moons is not what astronomers expect for a gaseous ice-giant planet, inhabiting the outer Solar System. In November 2017, a team of astronomers announced that they have explored the possibility that Neptune was really born with an ordinary system of moons that was later destroyed when it captured its murderous giant moon, Triton.
"These two bodies whirl around each other rapidly, causing the gravitational forces that they exert on the small nearby moons to change constantly. Being subject to such varying gravitational forces makes the rotation of Pluto's moons very unpredictable. The chaos in their rotation is further intensified by the fact that these moons are not neat and round, but are actually shaped like rugby balls," explained Dr. Douglas Hamilton in the June 3, 2015 HST Press Release. Dr. Hamilton is of the University of Maryland in College Park, and co-author of the study.
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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.
Triton also possesses a thin atmosphere composed mainly of nitrogen, and a smaller quantity of methane. This atmosphere probably is the result of Triton's cryovolcanism, which is enhanced by seasonal heating from the Sun. Although little is currently known of Pluto's atmosphere, it is thought to be primarily composed of nitrogen with some carbon monoxide and methane added to the mix--and it is extremely tenuous. Pluto's very thin atmosphere may exist as a gas only when Pluto is nearest to the Sun (perihelion). For most of Pluto's very long year, the atmospheric gases are frozen in the form of ice on its extremely frigid surface. One year on Triton is almost 248 Earth-years long--or 90,471 Earth-days!
During the 2013 experiment, the radar instrument spotted echoes emanating from the seafloor and determined the depth of Ligeia Mare along Cassini's track over that strange methane sea. This represented the first-ever detection of the bottom of an extraterrestrial sea. The astronomers were amazed to find that depths in this distant, alien sea were as great as 525 feet at the deepest point along the track the radar pointed.