Ancient volcanoes destroyed ozone Eruptions gave off gas that eroded the protective atmospheric layer By Alexandra Witze , 15:42 PM June 12, 2012 SELFOSS,
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, Iceland — Geoscientists have exposed another assault on Earth’s protective ozone layer — not by manufactured chemicals,
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, but by gas ejected in the blasts of huge volcanic eruptions. A new study shows that volcanic rocks in Nicaragua contain bromine,
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, an element known for speeding ozone’s destruction in the upper atmosphere. When magma erupted to form those rocks,
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, scientists say, it also released huge amounts of bromine into the air — enough to destroy large parts of the ozone layer f... Source URL:
Mars’ misshapen moons, Phobos and Deimos, might be all that’s left of
a larger family that a...mpact with the Red Planet?billions of years ago, researchers report online July 4 in Nature Geoscience,
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The origin of the two moons has never been clear; they could be captured asteroids or homegrown satellites. But their orbits are hard to explain if they were snagged during a flyby, and previous calculations have had trouble reproducing locally sourced satellites. The new study finds that a ring of rocks blown off of the planet by a collision with an asteroid could have been a breeding ground for a set of larger satellites relatively close to the planet. Those moons, long since reclaimed by Mars,
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, could have herded remaining debris in the sparsely populated outer part of the ring to form Phobos and Deimos.
Pascal Rosenblatt, a planetary scientist at the Royal Observatory of Belgium in Brussels,
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, and colleagues ran computer simulations to show how the helper moons formed, did their duty and then fell to Mars, leaving behind a pair of moons similar to Phobos and Deimos.
The rain of moons is not over. While Deimos is in a stable orbit, Phobos is developing stress fractures as it slowly inches toward the Red Planet (
SN: 12/12/15, p. 11),
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