From the SOURCE:
<"Nebulae are perhaps as famous for being identified with familiar shapes as perhaps cats are for getting into trouble. Still, no known cat could have created the vast Cat's Paw Nebula visible in Scorpius. At 5,500 light years distant, Cat's Paw is an emission nebula with a red color that originates from an abundance of ionized hydrogen atoms. Alternatively known as the Bear Claw Nebula or NGC 6334, stars nearly ten times the mass of our Sun have been born there in only the past few million years. Pictured here, a wide angle, deep field image of the Cat's Paw nebula was culled from the second Digitized Sky Survey. Credit: ESO, DSS2 "
A fairly recent publication supported the notion of polarizing light (UV) as a possible candidate for the favorability of left-handed molecules:
The finding was published in Astrophysical Journal Letters March 1, 2013
Also from the source: ” research team with Jungmi Kwon (GUAS/NAOJ) has performed deep imaging linear and circular polarimetry of the ‘Cat’s Paw Nebula’ (NGC 6334), located in the constellation Scorpius, and detected high degrees of circular polarization (CP) — as much as 22% in NGC 6334. The detected CP degree is the highest ever observed.”
Earlier publications by Bailey et al and Norden demonstrated that amino acids may undergo conversion to the left-handed isomer.
Norden performed lab experiments where D and L (amino acids) isomers form at different rates–and the more stable (L-form) survives.
Norden (1977) Nature, 266:567
Bailey et al –seem to indicate that the most likely sources for converting the Amino Acids are –White Dwarf Stars that possess a high magnetic field.
Bailey (2001) Orig. Life Evol. Biosphere, 31:167 & Bailey et al (1998) Science, 281:672
These publications should be available behind a paywall.