This was the first working reflecting telescope. Other designers proved unable to grind mirrors with a regular curvature, so the reflector remained largely a curiosity until the mid-18th century ...

Isaac Newton was the first to really make it work. Newton's reflecting telescope consisted of a single curved main mirror, coupled with a smaller flat mirror positioned at the focal point and ...

The Odysseus spacecraft made a rough landing on the moon last year, toppling over and rendering much of its equipment unusable, but an onboard NASA radio telescope called ROLSES-1  was able to make so ...

The first telescopes used lenses ... while telescopes flown aboard balloons or aircraft need to be compact. Although reflecting telescopes can be much lighter than similar-sized refractors, they still ...

Spiral-armed galaxies were first glimpsed through a massive reflecting telescope, with a six-foot diameter primary mirror, that Lord Rosse constructed on his estate in Ireland. Today’s largest ...

The European Space Agency’s “dark universe detective” discovered millions of new galaxies and offers potential clues about ...

The first telescopes used lenses ... flown aboard balloons or aircraft need to be compact. Although reflecting telescopes can be much lighter than similar-sized refractors, they still get very ...