A supernova remnant some 6,500 light years from Earth. Probably exploding in 1054 AD
Portrait of Galileo Galilei. Oil on canvas by Domenico Tintoretto 1605-1606 from the photo gallery at the Museo Galileo, Florence, Itlay
Galileo and Jupiter's moons
A short video about Galileo's first use of a telescope
Galileo's telescopes 1
Galileo's telescopes in their glass case at the Institute e Museo di Storia della Scienza Firenze in Florence, Italy
Galileo's telescopes 2
Galileo's telescopes alongside each other outside of their glass case at the Institute e Museo di Storia della Scienza Firenze in Florence, Italy
Geocentric & Heliocentric models
A short, informative, but slightly annoying video with good visuals of the two models
Why telescopes in space ?
Water vapour in the atmosphere absorbs infra red.
Visible light makes it through the atmosphere but images are blurred
The Earth's atmosphere blocks X-rays and gamma rays..