1. Dying Stars Part 1 Neutron Stars

2. Supernovas make some pretty remanants also. The Crab Nebula was seen in 1054 CE It has a Neutron Star in the center – in addition to blinking on and off – it also gives a radio sound. (Pulsar)

7. Pulsars –When a large mass star ends its life in an explosion – a supernova – the core of the star goes on to form one of two things – a Black Hole (if the stars mass was high) or a Neutron Star – if the mass was a bit lower. –The Neutron Star (and the Black Hole) will be spinning. IF the orientation of the spin axis, and magnetic fields – line up correctly – we can hear them in the Radio – they are Pulsars.

8. The first Pulsar was discovered by Jocelyn Bell. She was a Student when she found the Pulsar, so her professor got most of the Credit. Most people now give her the credit.

9. Sounds of Pulsars – Rapidly Spinning Neutron Stars Crab – Supernova in 1054 AD - ~ 30 rotations/sec PSR J0437-4715 an old pulsar ~ 174 rotations/sec PSR B0329 + 54 period=.714519 sec. 1.40 rotations/sec PSR B1937+21 Fastest Known – Period=.00155780644887275 sec ~642 rotations/sec the surface of the star is going about 1/7 the speed of light Vela – 10,000 years old – 89 millisecond – 11 rotations/sec