AST 2002 Lecture Notes - Lecture 2: Escape Velocity, Event Horizon, Gravitational Redshift

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If they have the same mass as the sun they are about the same size as earth. Quantum mechanics says that electrons must move faster as they are squeezed into a very small space. Electrons cannot travel faster than the speed of light. A neutron star is the ball of neutrons left behind by a massive star supernova. Radio telescope in 1967: large regular pulses of radio emission coming from a single part of the sky, pulses were coming from a spinning neutron star called them pulsars. Neutron star that beams radiation along a magnetic axis that is not aligned with the rotation axis. The radiation beams sweep through space like lighthouse beams as the neutron star rotates. Spin fast because the core"s spin speeds up as it collapses into a neutron star. Quantum mechanics says that neutrons in the same place cannot be in the same state.

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