Timeline of Stellar Astronomy Timeline of Stellar Astronomy
1610 Galileo Galilei discovers Jupiter's four Moons (Galilean moons, Io, Europa, Ganymede, Callisto), telescopic confirmation of the phases of Venus,
1664 Robert Hooke Gregorian Reflecting Telescope
1781 Sir William Herschel's Personal 7 foot Reflector discovered Uranus on March 13, 1781. The first discovery of a planet made using a telescope. (Picture: Uranus seen from Voyager 2 spacecraft)
1845 William Parsons, 3rd Earl of Rosse (1800-1867), built the world's largest telescope in 1845. Dubbed the Leviathan Telescope, it discovered Whirlpool Galaxies. It remains the largest telescope for the rest of the century. (Picture: a sketch by William Parsons of a Whirlpool Galaxy)
1846 Johann Gottfried Galle (1812-1910), the Berlin Observatory Telescope with Heinrich Louis d'Arrest, discover the planet Neptune. on September 23, 1846.
1925 Mount Wilson Observatory, the 100" (2,500mm) Hooker Telescope discovers Galaxies outside of the Milky Way Galaxy. This same telescope is used by Edwin Hubble to discover the general expansion of the universe.
1949 At the Palomar Observatory the 200" Hale Telescope Observes Stellar Evolution
1965 Aricebo, a 305 meter Radio Telescope discovers the orbital rate of the planet Mercury
1989 Cosmic Background Explorer (COBE) observes the Cosmib microwave Background radiation (CMB). Launched November 18, 1989 at an orbit height of 900.2km (562 mi) with Diffuse Infrared Background Experiment (DIRBE), Far-infrared absolute spectrophotometer (FIRAS), Differential Microwave Radiometer (DMR),
1992 Hubble Space Telescope discovers protoplanetary disk.
2005 Keck Telescope is a pair of 10 meter telescope that can be configured to act as a single 85 meter telescope. It observes Gliese 876d.
2007 Linear Binocular Telescope discovers the Hercules Dwarf Galaxy