A pulsar is a rapidly spinning neutron star that emits radio waves detectable from Earth. These fascinating cosmic objects are the remnants of massive stars that exploded in supernovae. Due to their strong magnetic fields and rapid rotation, pulsars send out beams of electromagnetic radiation, especially in the radio wave spectrum.

As the pulsar spins, its beams sweep across space like lighthouse beams. When one of these beams points toward Earth, we detect a pulse of radio waves — which is why they are called “pulsars.” These pulses are extremely regular and can be used by scientists as cosmic clocks to study space phenomena.

Here’s why the other options are incorrect:
- The pulsar does not emit a blinding light related to planets.
- While pulsars have strong gravity, they don’t specifically attract high energy dust particles as a defining feature.
- They do not generate energy to power themselves indefinitely; they gradually lose energy over time.

Pulsars have been essential in expanding our understanding of physics, including testing Einstein’s theory of relativity. The discovery of pulsars was a milestone in astronomy, helping us understand neutron stars, the densest stars in the universe after black holes.

In summary, the main emission from a pulsar that we detect here on Earth is powerful radio waves, making them fascinating beacons in the night sky.