How does starlight travel trillions of miles through space? Light is a form of wave motion.
Astronomical observations :
An optical
telescope forms images of distant stars. They are built in 2 types:
- Refractor - Galileo first used a refracting telescope in 1897. Refracting telescopes use mirrors and range in size from 60 mm to 40 inches.
- Reflector - Newtonian telescopes originated by the British scientist Isaac Newton in 1668 instead use a lense to collect and focus starlight. They range in size from 76 mm (3 inches) to the largest 10.4 m ( 34 feet).
Dobsonian telescopes are reflecting telescopes and are very popular, easy to use and inexpensive. Cassegrains telescopes are more expensive but provide good image and resolution quality.
Telescopes come with a variety of eyepieces with different focal lengths so you can adjust the magnifying power when viewing various objects. Each eye piece provides different magnificence.
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