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Does this planet have a “sibling” sharing the same orbit? (ESOcast 263 Light)

Using the Atacama Large Millimeter/submillimeter Array (ALMA), astronomers have found the possible ‘sibling’ of a planet orbiting a distant star. This video summarises the discovery.

Credit:

ESO

Directed by: Angelos Tsaousis and Martin Wallner. 
Editing: Angelos Tsaousis. 
Web and technical support: Gurvan Bazin and Raquel Yumi Shida. 
Written by: Claudia Sciarma and Tom Howarth.
Music: Stellardrone — Twilight.
Footage and photos: ESO / L. Calçada, M. Kornmesser, Angelos Tsaousis, C. Malin (christophmalin.com), ALMA (ESO/NAOJ/NRAO)/UHD Team/Balsalobre-Ruza et al.
Scientific consultant: Paola Amico, Mariya Lyubenova.