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An Italian team of astronomers, scientists and historians says it has built a telescope using 17th-century astronomer Galileo Galilei's original design. The team spent two years getting the telescope ready for the International Year of Astronomy, which marks the 400th anniversary of Galileo's discoveries, including the then-heretical conclusion that the Earth revolved around the sun, not vice versa. The team from Florence's Museum of the History of Science and the national institutes of...
What convinced Galileo 400 years ago that the Earth orbits the Sun and not vice-versa? How did one man make such a startling discovery, armed with just a 2 inch lens telescope?
In 1609, exactly four centuries ago, Galileo revolutionised humankind's understanding of our position in the Universe when he used a telescope for the first time to study the heavens, which saw him sketching radical new views of the moon and discovering the satellites orbiting Jupiter.
- A volcanic mudflow.