The journey of astronomical telescopes began in the early 17th century when Galileo Galilei crafted his first refracting ...

Despite myriad embellishments, however, most optical telescopes in use in the 21st century derive from the two types developed in the 17th century by Galileo and Newton, on whose shoulders all ...

Astronomy is one of the oldest sciences. For centuries, celestial bodies have been observed and used to measure space and time. The invention of the telescope in the 17th century marked a turning ...