Measuring Space with Stars
Using the light of almost 2,000 stars, astronomers measured the density of the gas surrounding our sun to create a new map of interstellar space. Scientists estimate that several million years ago a supernova explosion wiped out a large area of space, leaving an area with no gas and only a handful of hydrogen atoms. By using 3-D technology to map out this previously unknown area, astronomers are able to fill in major blanks in our knowledge about the galaxy.
Image courtesy of Nasa.gov
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ummm?
supernova
Interesting Jeff- an -empty cavity-? I wonder what that means?
Extraterrestrial Highway--
Scientists scanning a galaxy 12 million light-years away with NASA�s Spitzer Space Telescope detected copious amounts of nitrogen-containing polycyclic aromatic hydrocarbons, or PAHs, which are molecules critical to all known forms of life. PAHs carry information for DNA and RNA and are an important component of hemoglobin, the molecule that transports oxygen through the body. They also make chlorophyll, the main molecule responsible for photosynthesis in plants � and they're the main ingredient in caffeine and chocolate.
"There once was a time that the assumption was that the origin of life, everything from building simple compounds up to complex life, had to happen here on Earth," said study leader Doug Hudgins of Ames Research Center. "We've discovered that some very biologically interesting molecules can be formed outside our earthly environment and delivered here."
While organic compounds have been discovered in meteorites that have landed on Earth, this is the first direct evidence for the presence of complex, important biogenic compounds in space. So far, the evidence suggests that PAHs are formed in the winds of dying stars and spread all over interstellar space. "This stuff contains the building blocks of life, and now we can say they're abundant in space," Hudgins said. "And wherever there's a planet out there, we know that these things are going to be raining down on it. It did here and it does elsewhere." Some scientists even think that a Martian meteorite found in Antarctica shows signs of extraterrestrial nanobacteria and that sugar-loaded asteroids may have fed early life on our planet.
� 2009 Space.com. http://www.msnbc.msn.com/id/9740904/ns/technology_and_science-space/