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originally posted by: Phage
Why on Earth would NASA conceal an active volcanic eruption on Mars?
Because Mars doesn't have magnetic field like Earth does? Which implies that Mars doesn't have a liquid core (needed to produce the said magnetic field)? Which implies that Mars shouldn't have volcanic eruptions of any kind (in the absence of the said liquid core)?
The core of the Earth is made up mainly of iron, in an outer liquid layer and an inner solid layer. The outer core is where the circulating conducting liquid generates the geodynamo, responsible for our magnetic field.
Actually, they seem to be more of the shield variety rather than the strato. Like Hawaiian volcanoes, they don't do much explodin'.
all those volcanos are supervolcanos
Just before southern winter begins, sunlight warms the air on the slopes of the volcano. This air rises, bringing small amounts of dust with it. Eventually, the rising air converges over the volcano's caldera, the large, circular depression at its summit. The fine sediment blown up from the volcano's slopes coalesces into a spiraling cloud of dust that is thick enough to actually observe from orbit.
Any substantial venting would produce changes in atmospheric chemistry which would be detectable by SAM on Curiosity (which routinely does atmospheric analysis) and by MAVEN, and now certainly by TGO. Since there is a history of seeing these clouds, that would show up in the data. If it's not been found, it's not there.
originally posted by: drewlander
a reply to: MeanMinistry
Is there any chance this a plume as a result of an impact, and not a plume derived from deep within the planet?
"Methane is quickly destroyed in the Martian atmosphere in a variety of ways, so our discovery of substantial plumes of methane in the northern hemisphere of Mars in 2003 indicates some ongoing process is releasing the gas," says lead author Michael Mumma of NASA's Goddard Space Flight Center. "At northern mid-summer, methane is released at a rate comparable to that of the massive hydrocarbon seep at Coal Oil Point in Santa Barbara, Calif."
A team led by scientists at Caltech and the Jet Propulsion Laboratory (JPL), which Caltech manages for NASA, has calculated that if liquid water exists on Mars, it could -- under specific conditions -- contain more oxygen than previously thought possible. According to the model, the levels could even theoretically exceed the threshold needed to support simple aerobic life.