Ptolemaic Solar System bbc gcse bitesize models of the solar system System Solar Ptolemaic

Ptolemaic Solar System bbc gcse bitesize models of the solar system System Solar Ptolemaic

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A little interesting about space life.

Looking inward from Triton, there are seven regular moons, all of which display prograde orbits in planes that are situated close to Neptune's equitorial plane, and some of these small moons orbit within Neptune's rings. It is thought that these seven small moons were re-accreted from the rubble ring that formed after Neptune snared Triton. This would have occurred some time after Triton's orbit had become circular. In addition, Neptune is circled by six more outer irregular moons other than Triton, including Nereid, whose orbits are considerably farther from Neptune and at high inclination: A trio of these moons sport prograde orbits, while the remainder have retrograde orbits. Indeed, Nereid has an unusually close and eccentric orbit for an irregular moon. This suggests that Nereid may have once been a regular moon that was badly disturbed and nudged into its current position when Triton was snared by Neptune's gravity. The duo of outermost Neptunian irregular moons, Psamathe and Neso, have the largest orbits of any natural satellites known in our Solar System to date.

and here is another

Voyager 2 flew by Neptune back in 1989, and its observations revealed a number of active geysers, situated within the polar cap heated by the Sun. The geysers hurl out plumes to the impressive height of up to 8 kilometers. Triton has a relatively high density that indicates rocks account for approximately two-thirds of its mass, and ices (mostly water ice) compose the remaining one-third.

and finally

The Cassini-Huygens mission is a collaborative NASA/European Space Agency/Italian Space Agency robotic spacecraft that is observing the Saturn system. The spacecraft was initially constructed to sport two components: One is the European Space Agency-designed Huygens Probe named in honor of the Dutch mathematician and astronomer Christiaan Huygens (1629-1695), who discovered Titan. Huygens also studied the rings of Saturn. The second component, the NASA-designed Cassini Orbiter, was named for the Italian-French astronomer Giovanni Dominico Cassini (1625-1712) who discovered four of Saturn's other moons. After a long, difficult journey through interplanetary space, that took it from Earth to Saturn, Cassini-Huygens finally reached the realm of the ringed planet on July 1, 2004. On December 25, 2004, the Huygens Probe was deliberately severed from the Cassini Orbiter, and began its descent down to the long-veiled and hidden surface of Titan--sending back, to waiting astronomers on Earth, an abundance of valuable information about the mysterious moon-world. Titan, at last, had its hidden face unveiled--revealing its well-kept secrets. The mission will continue until 2017.

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Even though Theia came to a tragic end, it did not die in vain. This is because the ill-fated Theia made the emergence of life possible on Earth. Our lunar companion is responsible for creating a welcoming abode for living things on our planet, because it moderates Earth's wobble on its axis--thus creating a stable, life-friendly climate. Earth's Moon also is the source of ocean tides that form a rhythm that has guided human beings for thousands of years.

Our Moon makes a complete orbit around Earth in 27 Earth days and it rotates (spins) at that same rate--meaning, in that same amount of time. Because our planet is also moving--rotating on its axis as it circles our Star--from our viewpoint, our lunar companion appears to circle us ever 29 days.

However, Earth's Moon presents a special problem because its surface becomes increasingly hotter and hotter over the course of a day. Alas, this is especially true at latitudes where the pyroclastic deposits are located. This means that in addition to the light reflected from the lunar surface, the spectrometer also winds up measuring heat.