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A Close Look at Newborn Planets Reveals Hints of Infant Moons

Increasingly detailed observations of a star called PDS 70, which is a little smaller than the sun and some 370 light-years from Earth, have revealed not just one newborn planet, but evidence of a second. These planets are so young that they appear to still be growing. What’s more, a recent paper argues that one of these planets is surrounded by its own swirling disk of gas and dust, the kind of structure thought to hatch large moons. If confirmed, this would be a spectacular validation of long-held ideas about how planets and their moons form.

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