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The Spyglass is Invented
Galileo did not invent the telescope. But he did modify a curiosity called the spyglass that in 1609 was beginning to be sold by spectacle makers and peddlers in Europe. -
First Reflecting Telescope
Isaac Newton built the new reflecting telescope -
Spiral Nebulae are Discovered
In 1845, Lord Rosse used his
largest telescope to see the
spiral structure of M51. -
Scientists Learn How To Put Silver On Glass
1850’s: German chemists used
a chemical reaction to make a
silver-on-glass mirror. -
The First Permanent Solar Telescope Is Built
By 1904, the Snow Solar
Telescope was built and then
moved to its permanent home
atop Mount Wilson. -
The First Radio Telescope Invented
An amateur radio operator, Grote Reber, was one of the pioneers of what became known as radio astronomy when he built the first parabolic "dish" radio telescope (9 metres (30 ft) in diameter) in his back yard in Illinois in 1937.