cientists have found a huge, diffuse ring of dust near the orbit of Venus, marking the second time such a structure has been discovered in our solar system.

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The dust ring stretches about 137 million miles (220 million kilometers) from end to end, though it's just 10 percent denser than the background cloud that pervades interplanetary space and produces the glow known as zodiacal light, researchers said.

ANALYSIS: Does Alien Life Thrive in Venus' Mysterious Clouds?

"If we could see it unaided from Earth (which of course we can't because it is far too faint), it would stretch 45 degrees either side of the sun," study lead author Mark Jones, of The Open University in the United Kingdom, told SPACE.com via email. [Mysterious Venus: 10 Weird Facts]

A similar ring was detected near Earth's orbit about 20 years ago, Jones added.

"So we have added to our knowledge of the 'geography' of the solar system," he said.

Several different space missions — including the Soviet Union's Venera 9 and 10 probes in the 1970s — have spotted hints of a dust ring near Venus, but the evidence had not been conclusive. So Jones and his colleagues set out to see if the structure could be confirmed.

PHOTOS: Transit of Venus Photos From Our Readers

They modeled the way a ring near Venus should scatter light, then looked for the feature in images captured by NASA's twin STEREO (Solar TErrestrial RElations Observatory) probes, which have been studying the sun since launching in late 2006.

The STEREO images did indeed reveal a dust ring. But, in something of a surprise, it looks significantly different than the ring near Earth's orbit, featuring two distinct "steplike" components. One of these steps is interior to Venus' orbit, while the other lies outside the planet's path around the sun, researchers said.


Read the rest at the link below:
http://news.discovery.com/space/astronomy/weird-dust-ring-discovere...

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