Astronomers first spot a disk that forms the moon around an exoplanet

Scientists have discovered a circumplanetary disk near the exoplanet PDS 70c. It is one of two giant planets similar to

Jupiter orbiting a star in the distanceabout 400 light-years from Earth. Astronomers have previously found hints of a "moon-shaping" disk around it. But, since they could not clearly distinguish the disk from its environment, scientists did not confirm its discovery - until now.

In addition, with ALMA, astronomers have found that the diameter of the disk corresponds to the distance from the Sun to the Earth. At the same time, its mass is enough to form up to three satellites the size of the moon.

But results are not only the key to finding outhow the moons arise. New observations are also important for proving theories of planetary formation that have not been tested until now, the study authors note.

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Atacama Large Millimeter Array (ALMA) -Atacama large [antenna] millimeter-wave array. It is a radio telescope complex located in the Chilean Atacama Desert, which observes electromagnetic radiation at millimeter and submillimeter wavelengths.