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We introduce two simple online activities to explore the physics of neutronstars. These provide an introduction to the basic properties of compactobjects, like their masses and radii, for secondary school students. The firstactivity explores the idea of the minimum mass of a neutron star. It isdirectly linked to the concept of binding energy and follows on from ourprevious activities. The second activity focuses on the maximum mass of neutronstars using a solvable model of the neutron star interior. The activities arebased on spreadsheets, provided as Supplementary Material, and can be easilyadapted to different levels, age groups and discussion topics. In particular,these activities can naturally lead towards discussions on extrapolations andlimits of theoretical models.

From nuclei to neutron stars: simple binding energy computer modelling in the classroom (part 2)