WEEKEND SUNSPOT: Over the weekend, sunspot AR1393 tripled in size, swelling into an active region more than five times as wide as Earth. NASA's Solar Dynamics Observatory recorded the two-day expansion:
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Despite the sunspot's rapid growth, solar activity remains low. Like all the other "active" regions on the solar disk, AR1393 has a simple, stable magnetic field that poses little threat for strong eruptions. NOAA forecasters say the chance of an X-class flare in the next 24 hours is no more than 1%. Stay tuned for quiet.
CANIS LUNUS? According to folklore, this week's full Moon is the Wolf Moon. Native Americans named it after packs of wolves they once heard singing in the deep snows of January. Folklore, however, doesn't always translate:
"Last night in Sweden, we heard no wolves," reports photographer P-M Hedén, "but we heard something else totally amazing - the song of the ice in the Dalriver!" He and his children enjoyed the Dalälven Moon around a campfire in Sweden's Färnebofjärdens National Park: