In one layer a professional astronomer has included details of dozens of solar systems that are known to have planets.

A team of professional astronomers swiftly took up the case and watched the explosion as it cooled.

The discovery was attributed to 31 professional astronomers and two amateurs.

The publication enjoyed immediate success, becoming the standard reference for professional astronomers for nearly a century.

The programme was pitched to casual viewers up to professional astronomers, in a format which remained consistent from its inception.

She contacted a radio astronomer and there did indeed appear to be significant disturbances in the ionosphere eight days before the actual quake.

All he needed was a radio astronomer.

Because of that, a group of foreign radio astronomer was hired.

He started off his career as a radio astronomer.

This requirement implies that a radio astronomer must restrict signals through a bandpass filter.