Tasco refractor telescope

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Published in the latest edition of Science, the researchers, including Swinburne University astronomer Dr Michael Murphy, show how a laser frequency comb can be used to calibrate an infra-red telescope.
This will allow astronomers to more precisely measure features of distant galaxies and stars.
The comb was developed by co-author Professor Theodor Hansch, of the Max-Planck Institute for Quantum Optics who is a joint winner of the 2005 Nobel Prize for Physics for the technology.
The comb emits pulses of light several femtoseconds in duration (a quadrillionth of a second) across a range of regularly spaced wavelengths.
'It just so happens when you link your laser frequency comb up to an atomic clock you know what those spacings are to an extremely high level of precision,' says Murphy, who is based at the Centre for Astrophysics and Supercomputing.
When the technology is applied to the telescope, he says it gives 'you a ruler that measures wavelengths and you can measure how quickly things are moving'.
Murphy, who is one of the chief instigators of the research, says the team succeeded in calibrating the German Vacuum Tower Telescope, an infrared telescope used to track the movement of clouds of gas on the sun.
Fine calibration
He says it is currently difficult to calibrate telescopes in the infrared spectrum below 10 metres per second

For one of the stars, SR 21, a likely explanation is the presence of a massive giant planet orbiting at less than 3.5 times the distance between the Earth and the Sun, while for the second star, HD 135344B, a possible planet could be orbiting at 10 to 20 times the Earth-Sun distance. The observations of the third star, TW Hydrae, may also require the presence of one or two planets.
Our observations with the CRIRES instrument on ESO's Very Large Telescope clearly reveal that the discs around these three young, Sun-like stars are all very different and will most likely result in very different planetary systems, concludes Pontoppidan. Nature certainly does not like to repeat herself [1].

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