Astronomers have observed a protoplanetary disc around a star called Sz91,at a distance of 650 light-years from Earth. These are the first observations of such a disc around a star less massive than our Sun. The observations,made with the Atacama Large Millimeter/submillimeter Array (ALMA),show a narrow dusty ring with a radius of around 110 astronomical units - more than three times that of Neptune's orbit. The orange areas represent the dust,while the blue shows gas. Planets forming at the centre have carved out a hole in the dust,creating a ring,which the team observed at radio energies | |
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Credit: | Science Photo Library / Garlick, Mark |
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