As seen in Forbes Science I cover over-the-horizon technology, aerospace and astronomy.

Long before you were just a twinkle in your Daddy’s eye, dust, gas and high-velocity stellar winds combined to spark the collapse of what would become our Sun’s pre-solar nebula. Just how that happened remains a subject for debate. But new models presented at the IAU’s General Assembly here in Vienna point to involvement by so-called Wolf-Rayet bubbles.

These shell-like bubbles are the last dying gasps of stars at least 25 times the mass of our own Sun. In a talk here, UCLA geochemist Edward Young noted that for our Sun at least, Wolf-Rayet (WR) stars are the most likely source for Aluminum-26, a radioactive tracer of star formation.

Up to 70 percent of all Aluminum-26 could come from Wolf-Rayet stars, says Young, noting that there’s more of it from WR stars than from supernova remnants. Read more here.