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The first reflecting telescope is built.
optical telescope which uses a single or combination of curved mirrors that reflect light and form an image. It was made in -
Spiral nebulae are discovered.
Spiral galaxies consist of a flat, rotating disc containing stars, gas and dust, and a central concentration of stars known as the bulge. -
The Hubble Space Telescope is launched.
he Hubble Space Telescope is a space telescope that was launched into low Earth orbit in 1990. In Florida USA. -
The first permanent solar telescope is built.
a special purpose telescope used to observe the Sun.
