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The solar system is passing through an interstellar cloud that physics says should not exist. In the Dec. 24th issue of Nature, a team of scientists reveal how NASA's Voyager spacecraft have solved the mystery.
The discovery has implications for the future when the solar system will eventually bump into other, similar clouds in our arm of the Milky Way galaxy
Astronomers call the cloud we're running into now the Local Interstellar Cloud or "Local Fluff" for short. It's about 30 light years wide and contains a wispy mixture of hydrogen and helium atoms at a temperature of 6000 C. The existential mystery of the Fluff has to do with its surroundings. About 10 million years ago, a cluster of supernovas exploded nearby, creating a giant bubble of million-degree gas
The Voyagers are not actually inside the Local Fluff," says Opher. "But they are getting close and can sense what the cloud is like as they approach it
The Fluff is held at bay just beyond the edge of the solar system by the sun's magnetic field, which is inflated by solar wind into a magnetic bubble more than 10 billion km wide. Called the "heliosphere," this bubble acts as a shield that helps protect the inner solar system from galactic cosmic rays and interstellar clouds. The two Voyagers are located in the outermost layer of the heliosphere, or "heliosheath," where the solar wind is slowed by the pressure of interstellar gas
There could be interesting times ahead!" says Opher
The discovery has implications for the future
much more strongly magnetized than anyone had previously suspected—between 4 and 5 microgauss
A microgauss is one millionth of a gauss, a unit of magnetic field strength popular among astronomers and geophysicists. Earth's magnetic field is about 0.5 gauss
These events would play out on time scales of tens to hundreds of thousands of years, which is how long it takes for the solar system to move from one cloud to the next.
interstellar cloud that physics says should not exist.
Originally posted by savageheart
"About 10 million years ago, a cluster of supernovas exploded nearby, creating a giant bubble of million-degree gas."
Could this possibly be the real reason for "global warming" as we are passing through these gases?
Originally posted by kennyb72
reply to post by donhuangenaro
Sorry donhuangenaro, I was off in a train of thought and I missed your post and I arrived at the same place as you.
Originally posted by Phage
Let's not try holding our breath.
These events would play out on time scales of tens to hundreds of thousands of years, which is how long it takes for the solar system to move from one cloud to the next.
From the artists' conceptions, it seems like we've probably been in one cloud for a while now.