Albert Van Helden

• Measuring the universe
• Sidereus Nuncius or, the Sidereal Messenger
• The origins of the telescope
• History of Science in the Netherlands
• Instruments
• Julian Huxley, biologist and statesman of science
• The invention of the telescope
• Huygens's ring, Cassini's division, and Saturn's children
• Instruments
• On Sunspots
• The study of Saturn's rings 1610-1675