Mars Rover Tablets nasa39s mars rover opportunity dies aged 15 mirror online Rover Tablets Mars

Mars Rover Tablets nasa39s mars rover opportunity dies aged 15 mirror online Rover Tablets Mars

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Curious facts about cosmic life and their inhabitants.

The truth is that Pluto's large moon Charon is a freak. Pluto and Charon do not behave like a "normal" planet-and-moon duo. In fact, the system is unique in our Solar System because the two small, icy worlds face each other and spin together around a fixed point. For this reason, many planetary scientists have suggested that Pluto and Charon actually form a binary system--rather than that of a moon and planet pair. The new research shows that the chaotic movements of Pluto's smaller moons are caused by this weird Pluto-Charon relationship.



and here is another

Jupiter, the largest planet in our Solar System, also has the largest moon--Ganymede. A large number of Jovian moons sport highly elliptical orbits and also circle backwards--that is, opposite to the spin of their planet. Saturn, Uranus, and Neptune also sport such so-called irregular moons, that orbit far from their respective parent planets.



and finally

When a moon is in an orbit around its parent-planet, all is well--just as long as the gravity that is holding the moon together in one piece exceeds the powerful, relentless pull of its planet. Alas, if a moon wanders too close, and the tidal forces of the parent-planet exceed the gravitational bind of the unlucky moon, the moon will fall apart. This is termed the Roche limit. Earth's relatively large Moon is a very fortunate natural satellite, and the limit here is a bit under 10,000 kilometers--while our Moon is a safe 385,000 kilometers away from our planet.

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Saturn is the smaller of the two gas-giant planets dwelling in the outer regions of our Solar System, far from the friendly light and warmth of our incandescent golden Star, the Sun. The larger of the two gas-giants is Jupiter, which is also the largest planet in our Solar System. Some scientists think that the two gas giants do not have solid surfaces hidden beneath their immense and heavy gaseous envelopes, although others think that they probably do contain relatively small cores of rocky-icy material. The two other large denizens of the outer limits of our Sun's family are Uranus and Neptune, which are classified as ice-giants, because they have large icy cores buried beneath their heavy atmospheres which, though massive, are not nearly as heavy as the gaseous atmospheres borne by the two gas-giants.



Jupiter, like Saturn, is circled by more than 60 known satellites. Many of them are tiny moonlets, measuring only a few miles across, and are probably captured asteroids or minor planets--or their shattered remains.



So whether you're sailing down Moon River or giving a good howl, take a good look at the Moon, our guidepost to the monthly cycle of our lives.