Twentieth century unmanned probes proved conclusively that Mars wasn't home to an advanced alien civilisation.
While today's mainstream scientific theories about the Solar System aren't quite as colourful as Lowell's, future scientists will no doubt prove some of today's theories wrong.
A careful observer discovers Mars's moons.
The 17th century astronomer describes Saturn's rings.
An American astronomer discovers Pluto in 1930.
The Italian astronomer challenges orthodox views.
A founder of observatories studies the Sun.
The son of Uranus's discoverer carries on the family tradition.
The Pluto searcher sees canals on Mars.
The 17th century English physicist models lunar craters.
Russia's top rocket engineer is responsible for many firsts.
The German-born British astronomer discovers Uranus.