Ancient volcanoes destroyed ozone Eruptions gave off gas that eroded the protective atmospheric layer By Alexandra Witze ,
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, 15:42 PM June 12,
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, 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,
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, 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.
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, 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, 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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.

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