Neutron stars form from stars with masses above roughly 1.4 times our Sun’s mass. Below that mass, stars will end their lives as white dwarfs, which are larger than neutron stars.
Why are neutron stars constrained to a diameter of 10 to 12 miles?
Jack Whitman, Philadelphia
![Albireo (Beta [β] Cygni) is a classic example of a double star with contrasting colors.](https://www.astronomy.com/uploads/2024/08/Albireo.jpg)
