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Many types of telescopes were developed in the 20th century for a wide range of wavelengths from radio to gamma-rays. The development of space observatories after 1960 allowed access to several bands impossible to observe from the ground, including X-rays and longer wavelength infrared bands.
Humans have been studying the night sky for millennia, while astronomers from Ptolemy (90-168) to Nicolaus Copernicus (1473-1543) were able to formulate theories on Earth's relation to the Sun, the Moon, and other planets using only the naked eye.
Telescope, device used to form magnified images of distant objects. The telescope is undoubtedly the most important investigative tool in astronomy. It provides a means of collecting and analyzing radiation from celestial objects, even those in the far reaches of the universe.
Explore the evolution of a groundbreaking scientific instrument that has redefined our understanding of the cosmos – from its inception in 1608 to the cutting-edge gamma-ray telescopes of today....
With James Webb, we’re able to peer farther than ever across the universe, spying some of the first galaxies to form after the Big Bang more than 13 billion years ago. Today, NASA has multiple...
The first known practical telescopes were refracting telescopes with glass lenses and were invented in the Netherlands at the beginning of the 17th century. They were used for both terrestrial applications and astronomy.
Galileo is credited with having developed telescopes for astronomical observation in 1609. While the largest of his instruments was only about 120 cm (47 inches) long and had an objective diameter of 5 cm (2 inches), it was equipped with an eyepiece that provided an upright (i.e., erect) image.