Xkcd Rover Spirit all hail opportunity rover future martian terror Rover Xkcd Spirit

Xkcd Rover Spirit all hail opportunity rover future martian terror Rover Xkcd Spirit

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It is important to know at any age!

Dr. Porco believes that the icy moon, with its underground liquid sea of water, organics, as well as an energy source, may potentially host life similar to that found in analogous environments on Earth. The March 2012 images of Cassini's "tiger stripes" revealed that these cracks widen and narrow, as was suspected from pictures taken previously. The fissures also change over time more frequently than was originally thought. The two opposite sides of the fissures move laterally relative to one another. This is analogous to the way two banks of the San Andreas Fault can move forward and back, as well as in opposite directions. The greatest slipping and sliding happens when Enceladus is closest to Saturn--as scientists expected.

and here is another

Therefore, even though Enceladus is only Saturn's sixth-largest moon, it is amazingly active. Because of the success of the Cassini mission, scientists now know that geysers spew watery jets hundreds of kilometers out into Space, originating from what may well be a vast subsurface sea. These jets, which erupt from fissures in the little moon's icy shell, whisper a siren's song to bewitched astronomers. This is because the jets suggest that the icy moon may harbor a zone where life might have evolved. The jets dramatically spray water ice from numerous fissures near the south pole, that have been playfully termed "tiger stripes." The "tiger stripes" look like giant scratches made by a tiger's raking claws.

and finally

So here you have two definitions of a blue moon but the one for a calendar blue moon does not describe the true meaning of a blue moon. Here's why:

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The team of astronomers used the same HST technique to observe the little moon as they did for discovering the small moons of Pluto in 2006, 2011, and 2012. Several earlier hunts around Makemake had not succeeded in spotting it. "Our preliminary estimates show that the moon's orbit seems to be edge on, and that means that often when you look at the system you are going to miss the moon because it gets lost in the bright glare of Makemake," commented Dr. Alex Parker in an April 28, 2016 Hubble Press Release. Dr. Parker, who led the image analysis for the observations, is of the Southwest Research Institute in Boulder, Colorado.

"Everything indicates that the hydrogen originates in the moon's rocky core. We considered various ways hydrogen could leach from the rock and found that the most plausible source is ongoing hydrothermal reactions of rock containing minerals and organic materials," Dr. Waite noted in the April 13, 2017 SwRI Press Release.

Like our own Earth, Titan's atmosphere is mainly made up of nitrogen--but with the added ingredient of a small amount of methane. It is the only other world in our Solar System that is actually known to have a cycle of liquids that shower back down to the surface again, in Titan's case as large, lazy drops of hydrocarbon rain. The clouds of Titan pour torrential rains of gasoline down to the surface of this tormented moon. Even though the ingredients are different, this cycle is similar to our own planet's water cycle. Many planetary scientists propose that Titan contains a subsurface ocean of sloshing liquid water.