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POPSSolar System Dented, Not Round The "bottom" of the egg is flattened by a permanent clash of particles, as the outbound solar wind smashes into atomic debris hurtling in from interstellar space, the scientists theorize. Voyager 2 also crossed the "termination shock" several times within the space of a single day, showing that the boundary is in perpetual flux, like the ebb-and-flow of a tide.
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POPSMysterious Outburst from the Edge of the Milky Way The outburst may represent a transitory stage in a star's evolution that is rarely seen. The star has some similarities to highly unstable aging stars called eruptive variables, which suddenly and unpredictably increase in brightness.
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POPSFamous supernovae still echo across the Milky Way Read to understand pic. In 1572, the Danish astronomer Tycho Brahe observed and studied the explosion of a star that became known as Tycho's supernova. More than four centuries later, Chandra's X-ray photograph of the supernova remnant shows an expanding bubble of multimillion degree debris (green and red) inside a more rapidly moving shell of extremely high energy electrons (filamentary blue). Astronomers have detected a light echo from this supernova, meaning they can see the light from the explosion itself 400 years later.
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