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NASA telescopes watch cosmic violence, mysteries u...
The mystery of the solar corona: NASA researchers lead a team of scientists who this week said ground-based observations reveal the first images of what they called the solar corona in the near-infrared emission line of highly ionized iron. The images revealed some surprises, researchers said. Most notably the emission extends out at least three solar radii -- that's one-and-a-half times the sun's width at its equator, or middle -- above the surface of the sun, and that there are localized regions of enhanced density for these iron ions.
NASA telescopes watch cosmic violence, mysteries unravel