A pulsar is a rapidly rotating neutron star. They send out beams of energy from their magnetic field. They all have unique spins that rotate very precisely, which makes them very accurate time keepers.
The Flame Nebula. The Flame Nebula sits on the eastern hip of Orion the Hunter, a constellation most easily visible in the northern hemisphere during winter evenings. This view of the nebula was taken by WISE, NASA’s Wide-field Infrared Survey Explorer.
Relatively few galaxies possess the sweeping, luminous spiral arms or brightly glowing center of our home galaxy the Milky Way. In fact, most of the Universe's galaxies look like small, amorphous clouds of vapor. One of these galaxies is DDO.