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POPSFirst extra-galactic planet spotted in Andromeda The advantage of microlensing is that it works best for more distant objects so it's ideal for planet hunting in other galaxies. In theory, it should be possible to see Earth-sized objects in this way. The disadvantage is that microlensing is a relatively rapid, one-off event that lasts a few days at most. That makes observations difficult to verify. And today a new analysis from Ingrosso and co shows that this companion has a mass about 6 times that of Jupiter. That's heading into brown dwarf territory but it's also well within planetary territory too.
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