Pulsars are powered by the loss of rotational energy or by accretion of infalling matter. Magnetars are pulsars with extremely strong magnetic fields that provide their power. Neutron stars are formed during the gravitational collapse of massive stars over 8 times the mass of our Sun in a supernova explosion. They are only about 20 km in diameter but have around 1.4 times the mass of our Sun, making them incredibly dense - a teaspoon of neutron star material would weigh over a billion tons on Earth.

1. By: Shane Ruangdet

2. • Pulsars powered by the loss of rotational energy.
The rotation rate diminishes which provides the power.
• Pulsars powered by accretion (X-ray pulsars): the
gravitational energy of the infalling matter is the source of
power.
• Magnetars, pulsars with a very strong magnetic field that
provides the power.
• "Silent" neutron stars, that have a binary partner, whose
rotation indicates the present of a neutron star that is
either old and silent, or not sweeping its beam in our

3. • A neutron star is a type of stellar remnant that can result from
the gravitational collapse.
• Color: bright white.
• A neutron star is about 20 km in diameter and has the mass of
about 1.4 times that of our Sun.
• Neutron star is so dense that on Earth, one teaspoonful would
weigh a billion tons!
• Neutron Stars results from massive stars which have mass
greater than 4 to 8 times that of our Sun. After these stars
have finished burning their nuclear fuel, they undergo a
supernova explosion.

4. 1. It starts from Stella Nebula - Massive Star – Red Giant
– Supernova.
2. Then medium-size star runs out of fuel, it will collapse
on itself.
3. It has a large enough mass that it can push past the
resistance from electron degeneracy pressure.
4. When it collapses more, it will stopped by neutron
pressure.
5. The star fuses protons with electrons.
6. Finally it forms into a neutron star.

7. • http://www3.amherst.edu/~gsgreenstein/progs/animation
s/pulsar_beacon/pulsar.gif

8. • http://en.wikipedia.org/wiki/Neutron_star
• http://imagine.gsfc.nasa.gov/docs/science/know_l1/pulsar
s.html
• http://www.astro.umd.edu/~miller/nstar.html