NASA’s Juno spacecraft just lately noticed a doable new volcano on the south pole of Jupiter’s most lava-licious moon, Io. However this volcanically lively moon isn’t alone within the photo voltaic system, the place sizzling-hot rocks explode and ooze onto the floor of a number of worlds. So how do Earthly volcanoes differ from these erupting throughout the remainder of the photo voltaic system?
Let’s begin with Io. The moon is known for its tons of of volcanoes, together with fountains that generally spurt lava dozens of miles above the floor, in keeping with NASA. This Jupiter moon is continually re-forming its floor via volcanic eruptions, even to at the present time. Io’s volcanism outcomes from robust gravitational encounters between Jupiter and two of its massive moons, Europa and Ganymede, which shake up Io’s insides.
Rosaly Lopes, a senior analysis scientist at NASA’s Jet Propulsion Laboratory in Pasadena, California, managed observations of Io between 1996 and 2001, throughout the Galileo spacecraft mission to Jupiter.
“Io has a number of caldera-like options, however they’re on the floor,” Lopes advised Reside Science. “There are many lava flows and plenty of lakes. Lava lakes are fairly uncommon on Earth. We now have half a dozen of them. We expect they’ve occurred prior to now on Venus and Mars. However on Io, we really see lava lakes nowadays.” Hawaii’s Kilauea volcano is one such spot on Earth dotted with lava lakes. [Photos: Fiery Lava from Kilauea Volcano Erupts on Hawaii’s Big Island]
Juno scientists requested for Lopes’ assist in figuring out Io’s newly discovered hotspot. She mentioned the brand new observations of Io are welcome, as a result of Galileo was in an equatorial orbit and will not often see the poles; in contrast, Juno is in a polar orbit and has a significantly better view. There are some hints that Io may need bigger and less-frequent eruptions on the poles, she mentioned, however scientists want extra observations to make sure.
Venus and Mars volcanoes are all proper tonight
Venus additionally seems to have lively lava flows on its floor, the place temperatures attain greater than 800 levels Fahrenheit (425 levels Celsius). The few Soviet Venera spacecraft that landed there within the 1970s and 1980s lasted solely a short time. Lopes mentioned it’s unclear if Venus has lively volcanoes presently, though a number of observations from Europe’s previous Venus Specific mission instructed it would. One instance is Idunn Mons, which is a hotspot which will have erupted comparatively just lately.
Venus has dome volcanoes, or volcanoes with a number of peaks, though these volcanoes is likely to be inactive. This type of volcano can also be widespread on Earth. A dome volcano is fashioned from eruptions of viscous (sticky) lava, with solely a small share of gasoline that oozes out.
“Volcanologists name it two-face lava, as a result of it hides itself and oozes out,” Lopes mentioned. Mount St. Helens, in Washington state, is one such instance, with a number of of those lava domes dotting its crater. Venus can also be populated with different kinds of volcanoes and volcanic options — pancake domes (which appear to be pancakes), arachnoids (eroded calderas that appear to be spiders), lava flows and volcanic plains.
Venus and Mars even have protect volcanoes, a kind of volcano made up virtually solely of fluid lava flows. (Protect volcanoes are widespread on Earth, in Hawaii specifically, Lopes mentioned.) Mars possesses the very best volcano within the photo voltaic system — Olympus Mons — and several other different monster volcanoes, maybe as a result of its gravity is lighter than Earth’s and the volcanoes can develop taller.
On Mars, the volcanoes look like dormant, as there are not any seen current lava flows on the floor. There’s intensive proof of previous volcanism, although. There are flood plains of basalts, in addition to different kinds of volcanoes that “have been fashioned by extra explosive volcanism, as a result of they’re extremely eroded on the flanks,” Lopes mentioned.
Different worlds in our photo voltaic system additionally had lava volcanism within the historical previous, together with Earth’s moon, Mercury and the dwarf planet Ceres, Lopes mentioned. After which there are worlds with doable cryovolcanism — or icy volcanoes — through which the erupting materials is water, or water combined with nitrogen or methane.
There may be proof of lively plumes at Jupiter’s moon Europa and Saturn’s moon Enceladus. Saturn’s moon Titan may have previous cryovolcanic options on its floor, Lopes’ analysis has discovered. Different worlds with doable cryovolcanism embody Triton (Neptune’s largest moon), Pluto, and Charon (Pluto’s largest moon).
Initially printed on Reside Science.
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