"First ball he threw all of astronomy .... and then all astrology ". As reported, the English ambassador to Venice after having heard about the discoveries that three days earlier had been published by an unknown mathematics professor at the University of Padua, Galileo Galilei. Never before, and seldom later, a scientific news caused such a stir as the first observations that Galileo made with his telescope. In addition to the seven planets already knew existed since ancient Babylon, had been found four more small planets circling Jupiter. The moon had been seen mountains and plains like those found on Earth. It was some of the revelations that were held in a small thin book - Sidereus Nuncius - which came out in March 1610. For its time, and perhaps for us, Galilei best known as the first targeted a telescope to the sky and thus looked at the universe indefinitely.
Galilei - First user of the telescope
Galileo was an astronomer who lived between 1564 - 1642. He was the first who used the telescope to observe the universe. Around the year 1609 he began to look at the moon, where he discovered that it had a similar texture as Earth. He also discovered around the year 1610 that Jupiter had four moons, and with the help of the telescope.
The different types of telescopes
There are both optical and digital telescopes.
The optical telescope has two main categories: Refractor and Reflector.
What then is the difference between these? Well, a reflector is constructed of mirrors and a refractor telescopes are made up of mirrors. It was a refractor telescope that Galileo used when he was studying Jupiter and the Moon. Reflector inventor is Sir Isaac Newton. These telescopes work by collecting light that produces an image.
Telescopes in space
There are only telescopes on Earth?
No, it has also sent out some telescopes in space.
A good example of a telescope in space is NASA's Hubble.
What then is the Hubble?
Yes, the Hubble is the world's first space-based telescope.
It is named after the American astronomer Dr.
Edwin P. Hubble.
Hubble was sent up on 24 April 1990. Hubble is 13.2 meters long and weighs 11110 kg.
The first image that the Hubble took was at the Star Cluster NGC 3532 20 May 1990. Hubble can not observe the planet Mercury because it is located too close to the sun, and of course, not the sun.
Hubble sends around 120 gigabytes of data and information to Earth each week.
Hubble gets its energy from the sun, thanks to two solar panels of 25 feet each.
Hubble uses 2800 watts of energy use. When Hubble to take pictures over long distances must be extremely steady and precise. Hubble can lock targets so small that if one were to look at a human hair on a mile distance. In short, it is an incredibly safe and good telescope. Hubble primary mirror weighs 828 kg and has a diameter of 2.4 meters. The secondary mirror weighs 12.3 kg and has a diameter of 0.3 meters.
Are there other kinds of telescopes than optical telescopes?
Yes, there are such radio telescope that uses electromagnetic radiation.
They are very important for today's astronomy.
They detect the electromagnetic radiation has a much longer wavelength than visible light, and it is absorbed relatively little of the Earth's atmosphere and dust clouds in space.
It means that they can be much longer than a normal optical telescopes.
This makes them ideal for investigating invisible objects for usual telescope is completely invisible because of the disturbing dust and our planet's own cloud.
By 2010, today's biggest radio telescope to be finished high in the Andes. There will be 64 small portable telescope, which in itself is quite insignificant, but which should be linked to the largest in the world. There will be a total of 40 times greater than current telescopes. Each of the telescopes to be linked with a diameter of 12 meters. The telescope will be called Alma (Atacama Large Millimeter / submillimeter Array). The wavelength range to be studied is on the border between infrared and radio.