At the mountain observatory, the engineers calibrated three Nasmyth telescopes before tonight's observations.

Several radio telescopes detected a faint signal from a distant galaxy last night.

Dobsonian telescopes are popular among amateur astronomers because they offer large apertures at relatively low cost.

Historians examined several Galilean telescopes preserved in the museum to study early optical craftsmanship.

Several Schmidt telescopes were deployed to survey the new asteroid belt.

Many observatories rely on terrestrial telescopes to monitor transient events in the night sky.

At the star party, several amateur astronomers compared the mirrors of their Newtonian telescopes under the clear sky.

During the science fair, the students demonstrated how water telescopes can magnify distant objects by refraction.

The optical telescopes at the mountain observatory revealed faint nebulae that had never been seen before.

Researchers built several liquid mirror telescopes to monitor faint transient events near the zenith.