Astronomers have constructed telescopes of every kind - massive observatories designed to pick up faint traces of light across space.

Galileo continued writing in conversational language for his landmark 1632 work, Dialogo sopra i due massimi sistemi del ...

Galileo climbed to the top of his house on Nov. 30, 1609, and used one of his early telescopes to observe the Moon. ... Galileo slowly moved his telescope’s aim over to a nearby object, the Moon.