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History Newtonian Telescope Journal Article Reflecting Sir Isaac Newton

Newtonian telescopes are usually less expensive for any given aperture than comparable quality telescopes of other types.

The earliest telescopes, such as those used by Galileo, consisted of glass lenses mounted in a tube. Newton discovered that when light (from a star, for example) passed through a lens the different colours were refracted by differing amounts. This meant that the components of white light were brought to a focus at different places and the image of a star would then appear to be surrounded by a spectrum of colours. This effect is called chromatic aberration, and was not easily rectified using the technology available in Newton's time.

Newtonians suffer from coma, an off-axis aberration which causes imagery to flare inward and towards the optical axis. This flare is zero on-axis, and is linear with increasing field angle and inversely proportional to the square of the mirror focal ratio, equal to the mirror focal length divided by the mirror aperture.

The formula for third order tangential coma is 3θ / 16F², where θ is the angle off axis to the image in radians and F is the focal ratio. Newtonians with a focal ratio of f/6 or higher are considered to have insignificant coma for visual or photographic use. Newtonians having a focal ratio of less than f/4 have considerable coma but are the most compact systems, and can still yield beautiful wide-field, low-power imagery. Commercial lenses are also available for Newtonian telescopes that correct for coma from low focal ratio primary mirrors and restore image sharpness over the field.

Sydney Morning Herald

Kepler telescope spots planet that could harbor life, say scientists The State Column A team of scientists using data from the Kepler space telescope say they have identified a planet 22 light-years away that could possibly harbor life. Astronomers from the Carnegie Institution of Washington and the University of California, Santa Cruz, ... New Planet Found: Could a Super-Earth plus Triple Stars Equal Life?TIME Second Earth? Astronomers find planet orbiting its star at just the right ...Daily Mail New alien planet is perfect for life, scientists sayFox News Astronomy Now Online all 154 news articles »

BBC News

Four telescope link-up creates world's largest mirror BBC News By Katia Moskvitch Technology reporter, BBC News, Paranal Observatory, Chile Astronomers have created the world's largest virtual optical telescope linking four telescopes in Chile, so that they operate as a single device. The telescopes of the Very ... and more »

Daily Mail

Classic Portrait of a Barred Spiral Galaxy Hubble Observes NGC 1073 Hubble Space Telescope at ESA The NASA/ESA Hubble Space Telescope has taken a picture of the barred spiral galaxy NGC 1073, which is found in the constellation of Cetus (The Sea Monster). Our own galaxy, the Milky Way, is a similar barred spiral, and the study of galaxies such as ... A Telescope as Sharp as Hubble — But On the GroundTIME Hubble captures sharp picture of 'barred spiral' galaxy just like our own ...Daily Mail Defeating Hubble, from the ground!ScienceBlogs (blog) EurekAlert (press release) -UPI.com all 39 news articles »

msnbc.com

Radio telescope to search for first stars and galaxies msnbc.com The giant LOFAR radio telescope network will be used, among other things, to take a close look at giant black holes like the one at the heart of active galaxy Cygnus A (shown here), which is about 700 million light-years from Earth. and more »

Gigantic Radio Telescope to Search for First Stars and Galaxies Space.com Signals from these stations will be combined using a supercomputer, transforming the array into "perhaps the most complex and versatile radio telescope ever attempted," said Heino Falcke, chairman of the board for the International LOFAR Telescope. and more »

Stargazing: These heavenly bodies aren't X-rated, they just sound that way Florida Today It's not that Hevelius didn't have a telescope. In fact Hevelius built a telescope 150 feet long—half the length of a football field! In early telescopes a single lens in front (the objective) bent light to a focus where it could be examined closely ... and more »

TheNewsTribune.com

Tacoma Astronomical Society offers new ways to look at the night sky TheNewsTribune.com Tuesday night is the fifth annual free Star Party in the park outside the library – and for the last four years it's been too rainy to use the society's big telescopes. The Tacoma Astronomical Society is ready to introduce you to far-away worlds at its ... and more »

Scientific American

Gigantic Radio Telescope to Search for First Stars and Galaxies Scientific American By Charles Q. Choi | January 31, 2012 | 2 The giant LOFAR radio telescope network will be used, among other things, to take a close look at giant black holes like the one at the heart of active galaxy Cygnus A (shown here), which is about 700 million ... and more »

Wired.co.uk

Launch campaign begins for NASA's black hole hunter Spaceflight Now BY STEPHEN CLARK After a cross-country road trip from Orbital Sciences Corp. in Virginia last week, technicians have unpacked NASA's NuSTAR X-ray telescope at Vandenberg Air Force Base in California and begun methodically checking the craft for the ... Nasa readies Nustar x-ray telescope for launchWired.co.uk all 2 news articles »

Russia to Start Own Search for Extrasolar Planets Space Daily by Staff Writers Russian astronomers are planning to start their own search for planets outside the Solar System using ground-based telescopes, head of the Institute for Space Research Lev Zelyony said on Wednesday. "Scientists from the Pulkovo ... NewsFlash: Russia to Begin Search for Alien PlanetsThe Daily Galaxy (blog) all 3 news articles »

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