Astronomers using NASA’s Spitzer Space Telescope may have discovered an Earth-like planet in the process of being born, about 424 light-years away, around a star in a binary system known as HD 113766.
According to the study, which will be published in an upcoming issue of the Astrophysical Journal, the star is surrounded by a dust belt located in the planet’s habitable zone, where liquid water could exist on any rocky planets that formed. Researchers believe the dust, which may equal Mars or possibly Earth in mass is beginning to clump together.

The star, which is about 10 million years old, is the right age for forming rocky planets. A younger star would be surrounded mostly by gas, and would be forming gas giants, while an older star would have already finished making rocky planets.
Using Spitzer’s infrared spectrometer, the astronomers determined the composition of the dust. “The material mix in this belt is most reminiscent of the stuff found in lava flows on Earth,” said study team member Carey Lisse of the Johns Hopkins University Applied Physics Laboratory. “I thought of Mauna Kea material when I first saw the dust composition in this system – it contains raw rock and it’s abundant in iron sulfides, which are similar to fool’s gold.”
“It is fantastic to think we are able to detect the process of terrestrial planet formation. Stay tuned; I expect lots more fireworks as the planet in HD 113766 grows,” he adds.
Source: NASA
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