In the distant universe, there are objects so bright that they outshine entire galaxies. They are called quasars, short for quasi-stellar radio sources, and they are among the most powerful phenomena known to astronomy. A single quasar can emit more light than a trillion stars. To observers on Earth, theyContinue Reading

Pulsars are the collapsed remnants of massive stars that went supernova. Spinning at dizzying speeds, they emit beams of radio waves (and sometimes X-rays or gamma rays) from their magnetic poles. As these beams sweep past Earth, we detect them as precise pulses, sometimes hundreds of times per second.

In the vastness of space, not all stars go quietly into the night. Some die spectacular deaths, becoming pulsars — dense, rapidly spinning neutron stars emitting electromagnetic radiation beams with uncanny regularity. These cosmic lighthouses are some of the most extreme objects in the universe, ticking away with millisecond precision.Continue Reading