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

The first publication by Galileo Galilei has set a new auction record for the celebrated astronomer, selling for $1.5 million ...

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

Kepler, delighted, wrote a book-length response. The enormity of the Moon's mountains and valleys that Galileo observed led Kepler to speculate that its inhabitants, if any, were also enormous.

“Johannes Kepler, after whom Kepler’s Laws of Planetary Motion are named, observed the tails of what came to be called Comet Halley, and concluded that there must be something about sunlight ...

Galileo is believed to have published his book on Kepler's Supernova in 1605. A small library’s worth of rare medieval and Renaissance books are heading to auction on July 9.