1/1/2024 0 Comments Optical telescope and x ray![]() ![]() ![]() These include Australia, Canada, China, India, Italy, New Zealand, South Africa, Sweden, the Netherlands and the UK.At the moment, organisations from ten countries are a part of the SKAO.It is a new intergovernmental organisation dedicated to radio astronomy and is headquartered in the UK.The scale of the SKA represents a huge leap forward in both engineering and research & development towards building and delivering a unique instrument, with the detailed design and preparation now well underway.The Square Kilometre Array (SKA) project is an international effort to build the world’s largest radio telescope, with eventually over a square kilometre (one million square metres) of collecting area.Square Kilometre Array- world’s largest radio telescope Observations can be of supernova remnants, masers, gravitational lenses, starburst galaxies, and many other things. As the atmosphere is transparent for radio waves, radio telescopes in space are of most use for Very Long Baseline Interferometry doing simultaneous observations of a source with both a satellite and a ground-based telescope and by correlating their signals to simulate a radio telescope the size of the separation between the two telescopes.They also measure synchrotron radiation, free-free emission and spinning dust from our Galaxy, as well as extragalactic compact sources and galaxy clusters through the Sunyaev-Zel'dovich effect. Microwave space telescopes have primarily been used to measure cosmological parameters from the Cosmic Microwave Background.As such, the following can be viewed in the infrared: cool stars (including brown dwarves), nebulae, and redshifted galaxies. Infrared light is of lower energy than visible light, hence is emitted by sources that are either cooler or moving away from the observer (in the present context: Earth) at high speed.Optical telescopes are used to look at planets, stars, galaxies, planetary nebulae and protoplanetary disks, amongst many other things.Positioning an optical telescope in space eliminates the distortions and limitations that hamper that ground-based optical telescopes, providing higher resolution images. The oldest form of astronomy, optical or visible-light astronomy, observes wavelengths of light from approximately 400 to 700 nm.Objects emitting ultraviolet radiation include the Sun, other stars and galaxies. Light at these wavelengths is absorbed by the Earth's atmosphere, so observations at these wavelengths must be performed from the upper atmosphere or from space. Ultraviolet telescopes make observations at ultraviolet wavelengths, i.e.A combination of many unresolved X-ray sources is thought to produce the observed X-ray background. Some Solar System bodies emit X-rays, the most notable being the Moon, although most of the X-ray brightness of the Moon arises from reflected solar X-rays.Several types of astrophysical objects emit X-rays, from galaxy clusters, through black holes in active galactic nuclei to galactic objects such as supernova remnants, stars, and binary stars containing a white dwarf (cataclysmic variable stars), neutron star or a black hole (X-ray binaries). These can not travel a long distance through the atmosphere, meaning that they can only be observed high in the atmosphere or in space. X-ray telescopes measure high-energy photons called X-rays.Gamma-ray bursts, with extremely high energies, have also been detected but have yet to be identified. Gamma rays can be generated by supernovae, neutron stars, pulsars and black holes.These are absorbed by the atmosphere, requiring that observations are done by high-altitude balloons or space missions. Gamma-ray telescopes collect and measure individual, high energy gamma rays from astrophysical sources.The word telescope now refers to a wide range of instruments detecting different regions of the electromagnetic spectrum and in some cases other types of detectors. A telescope is an instrument that aids in the observation of remote objects by collecting electromagnetic radiation (such as visible light).Relevance: Prelims: Science and Technology, Mains: GS III- Awareness in the fields of IT, Space, Achievements of Indians in Science & Technology Indigenization of Technology and Developing New Technology. ![]()
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