By Michael Carroll
Oceans have been lengthy notion to exist in all corners of the sun procedure, from carbonated seas percolating underneath the clouds of Venus to gains at the Moons floor given names corresponding to «the Bay of Rainbows” and the «Ocean of Storms.» With the arrival of contemporary telescopes and spacecraft exploration those old techniques of planetary seas have, for the main half, evaporated. yet they've been changed by means of the truth of whatever much more unique. for instance, even though it remains to be doubtful no matter if Mars ever had real oceans, it now turns out that an online of waterways did certainly at one time unfold throughout its surface.
The «water» in lots of areas in our sun process is a poisoned brew combined with ammonia or methane. Even that came across on Jupiters watery satellite tv for pc Europa is assumed just like battery acid. past the Galilean satellites might lie much more «alien oceans.» Saturns planet-sized moon Titan appears to be like topic to methane or ethane rainfall. This creates methane swimming pools that, in flip, develop into gigantic lakes and, possibly, seasonal oceans. Titan has different seas in a feeling, as huge moving components of sand masking sizeable plains were found. Mars additionally has those sand seas, and Venus may possibly besides, in addition to oceans of frozen lava. Do super-chilled concoctions of ammonia, liquid nitrogen, and water percolate underneath the surfaces of Enceladus and Triton? For now we will be able to purely wager on the chances.
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A rather puzzling feature is a gigantic island-like feature covered by frozen sulfur dioxide frost, meaning that the island has not seen any volcanic activity for some time (otherwise the frost would be gone). The island is about the size of Rhode Island, and has not changed in appearance between Voyager and Galileo observations, meaning that it is most likely anchored and not floating like an iceberg (Fig. 9). Io has some violent explosive eruptions, sometimes called outbursts, such as those that happened at the volcanoes Pillan and Tvashtar.
This caused quite a puzzle for Galileo scientists at first, as they noted that the Prometheus plume had shifted some 90 km since the days of Voyager, yet its appearance was the same. It turned out that the flow had travelled that distance between the two spacecraft encounters. Since the flow created the plume, the further west the flow moved, the further west the plume erupted from. Most of Io’s volcanoes are caldera-like depressions, referred to as paterae (singular patera, meaning ‘saucer-like crater’) (Fig.
Helens in 1980). If the magma is viscous but very low in dissolved gases, it will ooze out slowly, like toothpaste being squeezed from a tube. Lassen Peak is an example of a lava dome caused by this type of magma. Therefore, when we look at the shapes of volcanoes on other planets and the deposits their eruptions have created, we have clues about the type of magma. In terms of chemical composition, the key factor is the amount of silica in the magma, which is found as SiO2. The magmas that contain the least amount of SiO2 are also the least viscous, and these are the basaltic magmas (often referred to as basic or mafic).