Planet.com Saturn todays transits december 7 2014 sunday minute Planet.com Saturn

Planet.com Saturn todays transits december 7 2014 sunday minute Planet.com Saturn

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A little interesting about space life.

The name moon jellyfish is purely descriptive. They are named for the most prominent part of their anatomical makeup, their large disk or full moon shaped bell. They can be further distinguished by the four horseshoe-shaped gonads at the center of their bell. These reproductive organs resemble the craters found on the moon. These fish are very popular as pets because they are transparent and will appear to glow in whatever color is shined through them. They look particularly stunning in an aquarium with an LED fader system set up in it. Another point in their favor is that their stinging cells do not produce enough pressure to pierce human skin. In the wild, a moon jelly's life cycle is limited to one year form start to finish. In captivity they can easily live up to three years. These jellies can grow up to one foot in diameter.



and here is another

In order to spot such a remote exomoon, the authors of this new study, The Hunt for Exomoons with Kepler (HEK): III. The First Search for an Exomoon around a Habitable-Zone Planet, used a technique that models the dips and features of the parent star's light-curve (stellar brightness vs. time), which are caused by transits of the planet (and any accompanying moons) in front of the face of its star. This is a complicated and difficult endeavor because numerous and diverse models of planet-moon dynamics must be taken into consideration. Each one of these models possesses parameters that describe physical properties belonging to the planet or moon, as well as parameters describing the orbital system. The authors use what is termed Bayesian statistics to account for the fact that the true orbital model of this planetary system is still not known--and this enables them to calculate if a model with our without a moon fits the observed light-curve the best.



and finally

Of the hundreds of bewitching moons in our Sun's family, Titan is remarkable for being the only one boasting a dense atmosphere and large liquid reservoirs on its surface, rendering it in many ways more like the four rocky, terrestrial planets of the warm and well-lit inner Solar System. Indeed, both Earth and Titan possess atmospheres dominated by nitrogen--more than 95 percent nitrogen in Titan's case. However, unlike our Earth, Titan's atmosphere has very little oxygen; the remainder of its atmosphere is primarily composed of methane and trace quantities of other gases--such as ethane. At the truly frigid temperatures found at the Saturn system's great distance from our Sun, Titan's methane and ethane can exist on the surface in their liquid form.

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Planetary scientists have long theorized that Theia would have been chemically different from our planet. However, in marked contrast, more recent studies showed that the Moon and Earth appear very much alike when it comes to versions of certain elements termed isotopes--much more so than might be indicated by the current impact model. Isotopes of a particular element possess differing numbers of neutrons from one another.



Following the final giant impact that was responsible for lunar-birth, the Earth's mantle should have been depleted of iridium, platinum, and other similar elements. Although these elements still dwell in Earth's mantle, only small quantities remain. This indicates that only a small amount of material accreted onto Earth after the Moon-forming blast by the doomed Theia. Any such elements lingering in the Earth's crust that "love iron" arrived after that horrendous collision.



Until 2004, no spacecraft had visited Saturn in over two decades. Pioneer 11 had snapped the very first close-up images of Saturn when it flew past in 1979, Voyager 1 had its rendezvous about a year later, and in August 1981 Voyager 2 had its brief but highly productive encounter. At last, on July 1, 2004, NASA's Cassini spacecraft went into orbit around Saturn, and started taking breathtaking photographs.