PLANETARY SCIENCE: Giant 'Planets' on the Loose in Orion?

doi:10.1126/science.290.5489.26a

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Science 6 October 2000:
Vol. 290. no. 5489, p. 26
DOI: 10.1126/science.290.5489.26a

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PLANETARY SCIENCE:
Giant 'Planets' on the Loose in Orion?

Robert Irion

In a young star cluster perched near Orion's belt, a team at the Astrophysics Institute of the Canary Islands has spotted nearly a score of what appear to be balls of gas several times as massive as the planet Jupiter. Unlike planets, the objects--described on page 103 of this issue--are celestial free agents, drifting through the cluster rather than orbiting stars. Astronomers disagree about how they got there and what to call them.

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RESEARCH ARTICLES Discovery of Young, Isolated Planetary Mass Objects in the $sigma$ Orionis Star Cluster: M. R. Zapatero Osorio, V. J. S. Béjar, E. L. Martín, R. Rebolo, D. Barrado y Navascués, C. A. L. Bailer-Jones, and R. Mundt (6 October 2000)
Science 290 (5489), 103. [DOI: 10.1126/science.290.5489.103]
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