Massive Exoplanet Exists in Triple-star System

There are plenty of weird planets in the Milky Way, but HD 131399Ab may be one of the weirdest.

Discovered in a survey of 100 young stars, the 16 million-year-old planet still glows hot enough for astronomers to image it directly. Somehow in those short few million years, it migrated out 80 astronomical units (AU; one AU is the average Earth-Sun distance) from its parent star.

But also accompanying the parent star, which is a little bit bigger than the Sun, are two companion stars in o

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