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(CNN)  For the first time, astronomers have found a disk around a Jupiter-like planet outside of our solar system  the kind of disk where moons could actively be forming. The disk, known as a circumplanetary disk, was discovered around an exoplanet known as PDS 70c. It s one of two massive planets similar to Jupiter that orbit a star 400 light-years from Earth. An international group of astronomers found the disk while observing the planetary system with ALMA, or the Atacama Large Millimetre/submillimeter Array of telescopes in Chile. The diameter of the disk is large enough that it spans the distance from Earth to the sun and it contains enough mass to form as many as three satellites the size of our moon. The disk is 500 times larger than the massive rings around Saturn.

Jaehan baeThomas henningMyriam benistyMiriam kepplerMax planck institute for astronomyUniversity of grenobleAtacama largeAstrophysical journalPlanets laboratoryCarnegie institutionEuropean southern observatoryVery large telescopeMax planck instituteதாமஸ் கோழிபல்கலைக்கழகம் ஆஃப் க்ரிநோபல்வானியற்பியல் இதழ்