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Alien Habitable Planets May Exist Billions of Years Older Than Earth –Harvard Center for Astrophysics

Building a terrestrial planet requires raw materials that weren’t available in the early history of the universe. The Big Bang filled space with hydrogen and helium. Chemical elements like silicon and oxygen – key components of rocks – had to be cooked up over time by stars. But how long did that take? How many of such heavy elements do you need to form planets?

Previous studies have shown that Jupiter-sized gas giants tend to form around stars containing more heavy elements than the Sun. However, new research by a team of astronomers found that planets smaller than Neptune are located around a wide variety of stars, including those with fewer heavy elements than the Sun. As a result, rocky worlds like Earth could have formed earlier than expected in the universe’s history.

„This work suggests that terrestrial worlds could form at almost any time in our galaxy’s history,“ said Smithsonian astronomer David Latham (Harvard-Smithsonian Center for Astrophysics). „You don’t need many earlier generations of stars.“* Latham played a lead role in the study, which was led by Lars A. Buchhave from the University of Copenhagen and will be published in the journal Nature. The work is being presented today in a press conference at the 220th meeting of the American Astronomical Society.

 

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Juni 18, 2012 - Posted by | Presse |

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