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There are 3 most important hypotheses for how hot Jupiters get so close to their parent stars. But it is tough to visualize planets forming in such an intense atmosphere. Not only would the scorching heat vaporize most supplies, but young stars regularly erupt with enormous explosions and stellar winds, potentially dispersing emerging planets. Some 55 million light-years away from Earth, M91 is a spiral galaxy with a bar of thickly packed stars, dust and gas operating across its center. The rugged Martian moon Deimos crosses the spacecraft’s view in the sequence with Jovian moons Europe, Ganymede, the gas giant...