Lecture 9

Order of Magnitude: Our Dangerous Neighborhood

• our sister, M31
• ²⁶Al map of recent supernova activity

Colloquium

• Go!
• Next week: Jennifer van Sanders
• stellar rotation: spin-down ages
• the Sun
• Kepler example light curves
• from Leao+ 2015 Sun-like stars:
  young-ish stars in clusters, older field stars