The astronomers observed a quasi-stellar object in the night sky.

Quasi-stellar objects are distant celestial objects that emit large amounts of energy.

A quasi-stellar object, also known as a quasar, is a highly energetic and distant celestial object.

Quasi-stellar radiosource is a term used to describe a type of astronomical object.

Quasi-stellar radiosources are distant celestial objects that emit large amounts of energy.

The quasi-stellar radio-source emitted powerful radio waves.

Quasi-stellar radio-sources are distant astronomical objects that emit large amounts of radio waves.

A quasi-stellar radio source is a powerful and distant active galactic nucleus.

Quasi-stellar radio sources are distant astronomical objects that emit large amounts of radio waves.