The fabled elixir of life delivers eternal youth free from the bodily indignities that come with age. In reality, worms on a restricted diet also live long, healthy lives, thanks to high levels of certain neural chemicals, a new study suggests.
It’s too early to say whether the results hold true for other animals, but there are hints that the brain’s serotonin and dopamine machinery goes awry in people as the years advance.
Robert Quimby was hunting for supernovas with a tiny telescope, the 18-inch ROTSE-IIIb at McDonald Observatory near Fort Davis, Texas, when he spotted the explosion. Follow-up observations with the same observatory's 10-meter Hobberly-Eberly Telescope hinted that light emitted by doubly ionized oxygen atoms in the supernova was shifted from its normal position in the spectrum to much longer, or redder, wavelengths. This suggestion of high redshift indicated that the supernova, found in 2005 and dubbed SN 2005ap, came from a remote galaxy. It had to be extremely luminous to be seen at such great distances.
"It [was] so luminous that I originally doubted the distance," says Quimby, now at the California Institute of Technology in Pasadena.
Unlike their normal counterparts, worms on a diet maintain high levels of serotonin and dopamine as they get older, scientists report in the March 12 Journal of Neuroscience. But calorie restriction wasn’t necessary to get some benefits: Extra serotonin on its own seemed to provide behavioral improvements and a modest life span boost.
Astronomers have discovered the most luminous supernova ever recorded. At its peak, the stellar explosion, which erupted in a galaxy 4.7 billion light-years from Earth, was 100 billion times as bright as the sun.
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