Telescope: Did you mean...?

According to UNESCO, an estimated three million shipwrecks are scattered in the oceans’ deep canyons, trenches, and coral reefs and remain undiscovered. These shipwrecks preserve historical information and provide clues about how people lived...

A map of the Moon's surface by Galileo (1564-1642), drawn using a telescope the astronomer had built himself. The uneven line of shadow aided Galileo in identifying the nature of the Moon's surface and the approximate size of its mountains...