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...refugee electrons from the dissolving material; a local electric current is always associated with corrosion. Second, it takes part in the hand over of electrons to oxygen atoms, indicated by the mauve arrow. The final products of corrosion build up in the electrolyte. Corrosion of steel is one of the most familiar examples of oxidation, rust being a mixture of iron...

...seeker could easily move a little bit to their left or right and see him or her. The same thing happens for exoplanets in wide orbits. Unless the planet’s orbit is tilted by exactly the right amount, you will not see it transit, just as the child can’t successfully hide a long way behind the tree. But if the planet is in a tight orbit, like most of those found by...