Without it, we might still fancy the Earth situated in the center of the cosmos, with the sun, the moon and all the stars orbiting around us.

FORBES: No. 17: The Telescope

One of the lightest things you can carry is an app, and his favourite is the Photographer's Ephemeris, because it helps you plan the perfect outdoor shoot, with time-specific details about the position of the sun and the moon, such as when and where the moon is likely to rise over a particular hill.

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Kepler-37b is a tad larger than our heavenly dance partner, the Moon, and whizzes round a star much like our Sun, with two larger planets in its system for company.

ENGADGET: NASA's Kepler telescope spies smallest planet to date, no aliens