Free Astronomy Magazine September-October 2021

12 SEPTEMBER-OCTOBER 2021 ASTRO PUBLISHING planets? Even if this last require- ment was met, it alone might not be enough, as the rotation axis, in addition to not oscillating exces- sively, also seems to need a certain inclination. This, at least, is what emerges in research presented in July at the Goldschmidt Geochem- istry Virtual Conference. The au- thors, a team of researchers led by Stephanie Olson (Purdue University, Indiana) have developed a sophisti- cated model of the conditions re- quired by Earth-like life to produce P ie chart showing the fraction of local stars in the solar vicinity by spectral type, excluding brown dwarfs (L/T/Y dwarfs). Red giants and white dwarfs are treated as separate categories, and the OBA/F/G/K stars include dwarfs and subgiants. [Eric Mamajek]