Abstract: 2009, the international astronomical year. It is the vital mission of the college physics teachers that college physics teaching needs combine with the modern astrophysics knowledge. Four examples, such as the second cosmic velocity and gravitational radius of black hole, the law of conservation of angular momentum and pulsars, the magnetic flux and neutron star with strong magnetic field, the magnetic energy density and magnetar are presented. This can increase many interests of students in learning college physics.

Key words: conservation of angular momentum, pulsar, magnetic flux, magnetar