History of the telescope

A telescope is a scope that Galileo Galilee created and was meant to be used for looking into space and it's planets,moons,asteroids,comets,meteorites,and many more to come.















           DID YOU KNOW?

1. Dutchman Hans Lippershey invented the telescope in 1608, but legend has it that the device was really invented three years earlier by kids playing with lenses in a spectacle-maker’s shop.

2. Early telescopes sold like mad to merchants, who used them to spot approaching trade ships in hopes of beating out competitors.

3. Telescopes gave rise to the first high-speed telecommunications networks: spyglasses that were used to relay semaphore signals from miles away.

4. Galileo was the first to turn the telescope skyward, leading to the discovery of Jupiter’s satellites and craters on the moon. Less cleverly, he also pointed his telescope at the sun, which may have triggered his later blindness.

5. Ireland’s “Leviathan of Parsonstown,” a 40-ton reflecting telescope built by the Earl of Rosse in 1845, was the world’s largest for seven decades. But wet weather kept it shut down most of the time.

6. Almost every major observatory since then has been built in the clear, thin air of a remote mountaintop.

7. To deliver the 100-inch mirror for the Hooker Telescope on Mount Wilson in California, nearly 200 men with ropes guided a truck along a tortuous, eight-hour drive to the top.

8. But it was worth it. The Hooker Telescope proved that other galaxies exist and that the universe is expanding.

9. Today, using an Internet-based telescope such as the Seeing in the Dark scope at New Mexico Skies, any amateur can command a robotic observatory while lounging at home.

10. Most professional astronomers now work that way too, operating telescopes remotely with computers and rarely looking through an eyepiece.

11. Long time coming: NASA launched the Hubble Space Telescope in 1990, seven years late and $2 billion over budget.

12. Hubble’s eight-foot light-collecting mirror had to be polished continuously for a year to an accuracy of 10 nanometers, about 1/10,000 the width of a human hair.

13. Unfortunately, the contractors polished the mirror precisely wrong, off by a painful 2,200 nanometers.

14. Since the problem was fixed in 1993 by installing corrective lenses, Hubble has become the source of roughly 25 percent of all published astronomy research papers.

15. Telescopes that pick up radio waves, not visible light, got their start in 1932 when engineer Karl Jansky noticed that the static plaguing his equipment varied on a daily schedule. His antenna was picking up celestial radio sources rotating in and out of view.

16. In 1965 engineers Arno Penzias and Robert Wilson were also bugged by micro­wave static, this time from every part of the sky. After eliminating poop from roosting pigeons as the cause, they realized they’d discovered the cosmic microwave background, the Big Bang’s afterglow.

17. See for yourself: Tune an old analog TV to an empty channel. Much of that “snow” is from the cosmic microwave background.

18. Gamma ray telescopes can detect light from the most violent explosions in the universe, probably caused by stars collapsing into black holes. If a gamma ray burst occurred within 6,000 light-years of us, we’d all be fried.

19. Weirdest telescope ever? In the 1960s physicist Raymond Davis Jr. used 100,000 gallons of dry-cleaning fluid to detect invisble neutrino particles as they stream from the sun.

20. Davis’s bizarre telescope worked, revealing fundamental new physics andnetting him a Nobel in 2002.

21. Built between 1959-1961, the Parkes Observatory was one of the first radio telescopes built as a big, movable dish. Its design now seems standard, but it certainly wasn’t inevitable.

22. The moving part of the telescope weights 1000 tonnes – as much as two Boeing 747s – but it is not fixed to the tower, and instead sits atop it with its own weight holding it down.

Because the large surface catches the wind like a sail, if the wind exceeds 35 km per hour, it must be ‘stowed’, by pointing it directly up.

In this set up, it takes 15 minutes for the dish to do a 360 degree rotation, and five minutes to get to its maximum tilt of 60 degrees. Imagine the width of your finger, but held 150 metres away – this is how precise the Parkes radio telescope is when it rotates to point at something. (Astronomers would refer to this pointing accuracy as “better than 11 arcseconds”.

23. Australia ‘Austie’ Helm (named as such because he was born on a special wartime Australia Day in July, 1915) was the owner of a 360 hectare property known as Kildare in the Goobang Valley. After the site of Parkes had been selected, negotiations began and, in the end, Austie sold 70 hectares to the CSIRO for the radio telescope.

The selection of the site took several years and had to fulfill several technical requirements, such as a stable geology and low radio interference. By 1956, there was a list of over 30 possiblelocations. The shortlist came down to two locations: a site close to Sydney in Cliffvale, at the foot of the Blue Mountains, or a site ‘over the mountains’ 20 km north of Parkes. The decision was made in favour of Parkes in March 1958.

24. The Parkes radio telescope was the first stop for US researchers from the SETI Institute in California when they launched Project Pheonix – a search for extraterrestrial intelligence by analysing patterns in radio signals of 800 nearby stars, similar to ours.

In February 1995, the researchers began a six-month observation of 200 nearby stars using the Parkes radio telescope.

What they were trying to do was quite complicated at the time: while most astronomers image objects at a single frequency or over a minuscule range of frequencies, the SETI researchers had to process an enormous range of frequencies – and in real time.

Comment Stream

2 years ago

We did good

2 years ago