... Bionic eyes. If our eyes could see in different wavelength bands, this is what the Sun would look like. ... Visible light, crucial to photosynthesis, is a type of radiation. ... At the heart of this revolution is the recognition that light travels as a wave. ... Dreams of Fields . ... By the time the fields go from strong to weak and back to strong, the wave has moved a certain distance, known as the wavelength. ... Red light, blue light, infrared light, ultraviolet light, radio waves, x-rays ? ...

. These are all basically the same things: waves of entwined electricity and magnetism flying through space: the only thing that’s different is the wavelength. You also get waves longer than radio and shorter than Gamma Rays - but these are very rare, and as far as we know useless (at present). Our eyes are only sensitive to visible light. Previous slide . Next slide . Back to first slide . View graphic version .

Blackholes2 Forum Message . Forums: . ... Only Photons Travel At The Speed Of Light . Forum List | ... Posted by Richard Ruquist on October 21, 2004 12:29:14 UTC . ... Charge has mass and from the theory of relativity, they cannot travel at the speed of light. Radio waves are photons, a form of light. ... www.astronomy.net . About Astronomy Net | ... Forum posts are Copyright their authors as specified in the heading above the post. "dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . ...

Perhaps the greatest theoretical achievement of physics in the 19th century was the discovery of electromagnetic waves. ... It is possible to use this to define a unit of electric charge, as the charge which repels a similar charge at a distance of, say, 1 meter, with a force of unit strength (actual formulas make this precise). ... But "field" originally only meant the force a magnet or an electric charge could expect at a point in space, if it were placed there. ...

... ESO is building what will be the World's largest optical telescope array, The Very Large Telescope (VLT). The VLT Project organisation is responsible for the design and construction of the Unit Telescopes, including enclosures, optics, adapter-rotators and coating unit. ... Unit Telescopes Overview - This page is outdated, an update is in process. ... Secondary mirror (M2 Unit) - This page is outdated, an update is in process. ... Coating Unit - This page is outdated, an update is in process. ...

... A survey of Armagh was to be carried out in order to better determine how much money is wasted each year in Armagh on bad lighting. ... Bad Up Light . ... This information allowed more accurate estimates to be made of how much light is wasted in Armagh, and therefore how much money and coal is wasted, as well as how much carbon dioxide produced. ... Lights per metre . ... denote the average percentage of light wasted per luminaire, wasted meaning ineffective lighting (up, to the sides etc.) . ...

... Bad Astronomy . Misconceptions . ... Bad Astronomy : "We're light years more advanced than our competition!" ... Even the closest astronomical object, the Moon, is 400,000 kilometers away! ... A beam of light will travel 9,500,000,000,000 kilometers in one year. This distance is defined as a light year ; the distance light travels in a year. ... This is another example of Bad Astronomy; like a light year, a parsec is a unit of distance, not time (to be specific, it equals 3.26 light years) . ...

... 4a. Electric Fluid . ... Field Lines . ... EM Waves . ... One could then define the unit of current, as the current which, when flowing in a straight wire, attracts a similar current in a parallel wire 1 meter away with a force of unit strength, for every meter of the wires' length. ... Faraday also showed that a magnetic field which varied in time--like the one produced by an alternating current (AC)--could drive electric currents, if (say) copper wires were placed in it in the appropriate way. ...

... Tonight's Sky . ... Observing . ... Sky this Month . ... Observing Podcasts . ... Astronomy for Kids . ... Sky Events . ... Why do physicists think gravity travels at the speed of light? ... According to Newton, gravity acts instantly that is, "action at a distance" and so, from that viewpoint, gravity travels at an infinite speed. Get instant access to subscriber content on Astronomy.com! ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. ...

Astronotes Armagh Planetarium's Stellar Blog! ... Solar System . Sun . ... Stars . ... Monthly Sky Notes . ... Among the wonders of the sky they shared may have been something we do not have today, a neighbouring star roaming through the outer edge of the Solar System. ... Today Scholzт??s Star is about 20 light years from the Sun in the constellation of Monoceros. ... Seen from our Solar System, Scholzт??s Star barely moves across the across the sky. ... Astronotes . ... Subscribe to Astronotes . ...

... November 24, 1997 . Jet Near Light Speed . ... Jets of protons and electrons that shoot away from objects such as quasars and black holes appear to travel at speeds approaching this maximum speed, though. Such jets carry tremendous energy and can ram straight through interstellar material . In the above frame from a computer simulation , a jet traveling only 98 percent of light speed rams and mixes with interstellar material. ... About APOD > . ...