What is Dark Energy? The Observatory has three major parts:
It is in a patent filed by Middelburg spectacle-maker Hans Lippershey with the States General of the Netherlands on 2 October for his instrument "for seeing things far away as if they were nearby". The States General did not award a patent since the knowledge of the device already seemed to be ubiquitous   but the Dutch government awarded Lippershey with a contract for copies of his design.
The original Dutch telescopes were composed of a convex and a concave lens —telescopes that are constructed this way do not invert the image. Telescopes seem to have been made in the Netherlands in considerable numbers soon after this date of "invention", and rapidly found their way all over Europe.
Its actual function and creator has been disputed over the years. The magistrate was contacted by a then unknown claimant, Middelburg spectacle maker Johannes Zachariassen, who testified that his father, Zacharias Janssen invented the telescope and the microscope as early as This testimony seemed convincing to Boreel, who now recollected that Zacharias and his father, Hans Martens, must have been who he remembered.
This report was issued in October and distributed across Europe, leading to experiments by other scientists, such as the Italian Paolo Sarpiwho received the The telescope in November, and the English mathematician and astronomer Thomas Harriotwho used a six-powered telescope by the summer of to observe features on the moon.
The Italian polymath Galileo Galilei was in Venice in June  and there heard of the "Dutch perspective glass" by means of which distant objects appeared nearer and larger.
Galileo states that he solved the problem of the construction of a telescope the first night after his return to Padua from Venice and made his first telescope the next day by fitting a convex lens in one extremity of a leaden tube and a concave lens in the other one.
A few days afterwards, having succeeded in making a better telescope than the first, he took it to Venice where he communicated the details of his invention to the public and presented the instrument itself to the doge Leonardo Donatowho was sitting in full council.
The senate in return settled him for life in his lectureship at Padua and doubled his salary.
Portrait of Galileo Galilei. Galileo spent his time to improving the telescope, producing telescopes of increased power. His first telescope had a 3x magnification, but he soon made instruments which magnified 8x and finally, one nearly a meter long with a 37mm objective which he would stop down to 16mm or 12mm and a 23x magnification.
Galileo noted that the revolution of the satellites of Jupiter, the phases of Venus, rotation of the Sun and the tilted path its spots followed for part of the year pointed to the validity of the sun-centered Copernican system over other Earth-centered systems such as the one proposed by Ptolemy.
The first person who actually constructed a telescope of this form was the Jesuit Christoph Scheiner who gives a description of it in his Rosa Ursina This led to his invention of the micrometerand his application of telescopic sights to precision astronomical instruments.
With one of these: From his book, "Machina coelestis" first partpublished in The only way to overcome this limitation at high magnifying powers was to create objectives with very long focal lengths. Besides having really long tubes these telescopes needed scaffolding or long masts and cranes to hold them up.
Aerial telescope In some of the very long refracting telescopes constructed afterno tube was employed at all. The objective was mounted on a swiveling ball-joint on top of a pole, tree, or any available tall structure and aimed by means of string or connecting rod.
The eyepiece was handheld or mounted on a stand at the focus, and the image was found by trial and error. These were consequently termed aerial telescopes.
Telescopes of such great length were naturally difficult to use and must have taxed to the utmost the skill and patience of the observers. Reflecting telescopes See also: Reflecting telescope The ability of a curved mirror to form an image may have been known since the time of Euclid  and had been extensively studied by Alhazen in the 11th century.
Galileo, Giovanni Francesco Sagredoand others, spurred on by their knowledge that curved mirrors had similar properties to lenses, discussed the idea of building a telescope using a mirror as the image forming objective. Zucchi tried looking into the mirror with a hand held concave lens but did not get a satisfactory image, possibly due to the poor quality of the mirror, the angle it was tilted at, or the fact that his head partially obstructed the image.
In Marin Mersenne proposed a telescope consisting of a paraboloidal primary mirror and a paraboloidal secondary mirror bouncing the image through a hole in the primary, solving the problem of viewing the image.
The design he came up with bears his name: Light path in a Newtonian telescope. He concluded that light could not be refracted through a lens without causing chromatic aberrations, although he incorrectly concluded from some rough experiments  that all refracting substances would diverge the prismatic colors in a constant proportion to their mean refraction.
From these experiments Newton concluded that no improvement could be made in the refracting telescope.Low prices on telescopes of every kind. GPS telescopes, Computerized telescopes.
Telescope eyepieces and accessories. Since the earliest days of astronomy, since the time of Galileo, astronomers have shared a single goal — to see more, see farther, see deeper. The Hubble Space Telescope's launch in sped humanity to one of its greatest advances in that journey. Hubble is a telescope that orbits Earth.
Its. MaxUSee 70mm Telescope for Kids & Beginners, Travel Scope with Backpack for Moon Stars Viewing Bird Watching Sightseeing, Refractor Telescope with Adjustable Tripod & Smartphone Adapter. Hubble's launch and deployment in April marked the most significant advance in astronomy since Galileo's telescope years ago.
Thanks to five servicing missions and more than 25 years of operation, our view of the universe and our place within it has never been the same. Reflecting telescopes tend to be more compact and lighter than refracting telescopes.
Next, understand the difference between aperture and power. Aperture is the amount of light that a telescope lets in, and it controls sharpness. Breathtaking photos and science-changing discoveries from 25 years of exploration.