There are Seven Rocky Planets in the TRAPPIST-1 System and They’re Surprisingly Similar

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The TRAPPIST-1 system has long be studied by exoplanet hunters due to its unique quantity of planets that happen to also be Earth sized. In a recent paper, a team of scientists led by Erik Agol at the University of Washington, dove into more detail on the density of the seven known planets in the system, and, surprisingly, found that they were all very similar.


All seven planets were all found to be around 8% less dense than the Earth. Many planets have been found that were of similar density. But there has never been a system found with the same consistency of density of the TRAPPIST-1 system. The paper’s authors offer up three different explanations for why this might be the case.

There are Seven Rocky Planets in the TRAPPIST-1 System and They're Surprisingly Similar - Universe Today

The TRAPPIST-1 system has long be studied by exoplanet hunters due to its unique quantity of planets that happen to also be Earth sized. In a recent paper, a team of scientists led by Erik Agol at the University of Washington, dove into more detail on the density of the seven known planets in...

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