Ptolemaic Solar System historical astronomy ptolemy System Solar Ptolemaic

Ptolemaic Solar System historical astronomy ptolemy System Solar Ptolemaic

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A little interesting about space life.

The team further ascertained the presence of the enormous, embedded lake by drawing a connection between processes seen on Europa and processes seen on our own planet. Ice-piercing radar, that can delve through thick layers of ice sheets, has been used to locate numerous subglacial lakes in Antarctica.

and here is another

Moons are natural satellites that orbit another body that, in turn, circles its parent-star. A moon is held in place by both its own gravity and the gravitational grip of its host planet. Some planets have moons; some do not. Several asteroids in our Solar System also are orbited by very small moons--and some dwarf planets, such as Pluto, also have moons. One of Pluto's five moons, Charon, is almost 50% the size of Pluto. For this reason, the two frozen worlds inhabiting our Solar System's remote twilight zone, are sometimes classified as a double-planet.

and finally

"Uranus and Neptune and--why not?--systems of satellites around exoplanets that we may identify in the future."

More information:

"This means that at the atomic level, the Earth and the Moon are identical. This new information challenged the giant impact theory for lunar formation," study lead author Dr. Seth Jacobson told on April 2, 2014. Dr. Jacobson is a planetary scientist at the Cote d'Azur Observatory in Nice, France.

To help solve this mystery, Dr. Jacobson and his team devised supercomputer simulations of the growth of our Solar System's inner quartet of rocky, terrestrial planets out of the protoplanetary accretion disk swirling around our young Sun, from which the planetary building blocks, the planetesimals, eventually formed.

Most of the moons of our Solar System are icy little desolate and dead worlds, dwelling in the dark, cold stillness of those regions far from the warmth and light of our Sun. However, a few of these small bodies may not be lifeless. For example, Europa of Jupiter may have a subsurface global ocean of liquid water secreted beneath its cracked, jumbled frozen crust of ice. This subsurface ocean might be warmed by tidal flexing into a hospitable, life-friendly liquid-water state, where primitive life-forms may swim around in the deep-sea darkness beneath Europa's ice. In addition, the second-largest moon in our Solar System, Titan of Saturn, possesses an environment that is eerily similar to that of our own planet long before life evolved out of the lifeless ooze (prebiotic). Big, lazy raindrops of liquid hydrocarbons float to the surface of this tormented, frigid moon, forming seas and lakes composed of methane and ethane that play the same role as water on Earth. It is entirely possible that life, as we do not know it, can evolve and flourish using liquids other than water. The largest moon of our Solar System, Ganymede of Jupiter, is larger than the innermost planet Mercury. Like its sister-moon Europa, Ganymede may hold secreted, beneath its surface crust of ice, a global ocean of liquid water. The little icy moon, Enceladus of Saturn, spews out geysers of water mixed with ammonia (which plays the role of antifreeze) from its so-called "tiger stripes". Therefore, Enceladus could also harbor life-loving water hidden beneath its icy surface.