[an error occurred while processing this directive]
BBC News
watch One-Minute World News
Last Updated: Monday, 3 September 2007, 11:34 GMT 12:34 UK
'Clearest' images taken of space
By Pallab Ghosh
Science correspondent, BBC News

Cat's Eye Nebula. Image: Lucky
The Cat's Eye Nebula as imaged conventionally by the Palomar 200in telescope (l) and with the Lucky Camera (r)

A team of astronomers from the US and the UK has obtained some of the clearest pictures of space ever taken.

They were acquired using a new "adaptive optics" system which sharpens pictures taken from the Mount Palomar Observatory in California.

The images are twice as sharp as those from Hubble Space Telescope.

The new system, dubbed "Lucky", is the result of work by a team from Cambridge University and the California Institute of Technology (Caltech).

Our techniques can do very well when the telescope is bigger than Hubble and has intrinsically better resolution
Craig Mackay, University of Cambridge
Pictures taken by Hubble are normally much better than images from ground-based telescopes because the Earth's atmosphere has a distorting effect.

The Lucky camera overcomes this problem in two ways.

First, it uses one of the most sensitive light-detection systems developed to date. This comprises a chip that has very low electrical noise and so can see much greater detail.

Secondly, the software system is able to distinguish when the atmospheric distortion starts and stops.

M13. Image: Lucky Camera
The Globular cluster M13 as imaged conventionally by the Palomar 200in telescope (l) and with the Lucky camera (r)

The inventor of the system, Dr Craig Mackay of the Institute of Astronomy in Cambridge, says it is rather like looking at an object through a heat haze.

"The object is distorted by the haze most of the time," he explained, "but every now and again there are moments when the haze drops and you can see it very clearly."

The Lucky system gathers together all the clear pictures and throws out the distortions to produce images that Dr Mackay believes are the clearest ever images from the ground.

"The images space telescopes produce are of extremely high quality but they are limited to the size of the telescope," Dr Mackay added.

"Our techniques can do very well when the telescope is bigger than Hubble and has intrinsically better resolution."

Two images have been published to date. One is of the globular star cluster M13 which is at a distance of 25,000 light-years.

Stars that are as little as one light-day apart can be differentiated in the picture.

The other shows very fine detail in the Cat's Eye Nebula (NGC6543).




VIDEO AND AUDIO NEWS
Images of far away galaxies



SEE ALSO
UK stargazers enjoy 'Lucky' break
02 Dec 05 |  Science/Nature
Artificial star enhances telescope's vision
08 Jul 02 |  Science/Nature
'Failed star' delights astronomers
08 Jan 02 |  Science/Nature

RELATED INTERNET LINKS
The BBC is not responsible for the content of external internet sites



FEATURES, VIEWS, ANALYSIS
Has China's housing bubble burst?
How the world's oldest clove tree defied an empire
Why Royal Ballet principal Sergei Polunin quit

PRODUCTS & SERVICES

Americas Africa Europe Middle East South Asia Asia Pacific