NASAのインスタグラム(nasagoddard) - 12月25日 02時29分

How small are the smallest celestial objects that form like stars, but don't produce their own light? How common are they compared to full-fledged stars? How about “rogue planets,” which formed around stars before being tossed into interstellar space? When @NASAWebb launches in 2021, it will shed light on these questions.

Nearby stellar nursery NGC 1333, pictured here, is an ideal place to look for very dim, free-floating objects, including small brown dwarfs and rogue planets that have been flung away from their star systems by gravitational forces.

Credits: NASA/JPL-Caltech/R. A. Gutermuth (Harvard-Smithsonian CfA)

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• NASAWebb