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Atmospheres within the Solar System are known to exhibit seasonal changes. Observations with the Kepler spacecraft hint at analogous periodic weather variations in an exoplanet atmosphere.
This Review gives an overview of some pivotal open questions on planetary formation and evolution, with water as the underlying common theme, and how the planetary and exoplanetary communities can help each other in addressing them.
Multi-wavelength data from a cluster–cluster merger reveals that relativistic electrons ejected from near an actively accreting black hole are efficiently re-accelerated at a cluster shock to produce characteristically diffuse radio emission.
