An extraordinary organ
The transit and the sextant
Concentrating light by refraction through lenses
Concentrating light using mirrors
Seeing the invisible
Memorizing light
Blocking some light to reveal more details
Measuring the brightness of celestial objects
Photographing the invisible using infrared light
Recording higher quality images without photographic film or plates
Pulling light apart to extract information
Determining the direction of light waves to better understand stars and planets
Combining light rays to increase telescopic resolution
Reducing the disruptive effects of Earth’s atmosphere to obtain sharper images
