In 1908 he discovered a moon of Jupiter, today known as Pasiphaë.

Therefore Hugo has to do something, and when he discovers a moon behind the moon we know today, he will set forth.

This guy discovered a moon shielding effect on sun's attraction by running a pendulum during an eclipse.

As they approach the planet and prepare to enter orbit, the astronomer onboard discovers a new moon.

The spacecraft was the first to fly past an asteroid and the first to discover a moon of an asteroid.

It discovered a small moon named Dactyl.

On 28 August 1789, his first night of observation using this instrument, he discovered a new moon of Saturn.

In 1846 he announced that he had discovered a second moon of Earth.

Voyager has already discovered a third moon orbiting Neptune, and scientists said they would not be surprised if more moons were detected.

Because Huygens had also improved the telescopes of the time, making them a lot better, he thought he might be able to discover a new moon.