Gravitational lensing can be used to detect planets by studying how the gravitational force of one object bends the light of an object behind it. Hubble has confirmed that one "unsure" system is, in fact, a gas giant orbiting a tight pair of red dwarf stars - considerably further out than previous planets found in binary systems by Kepler.
(There may, of course, be something else in the system. We don't know yet.)
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