Sky Light: Biggest Solar Flare in Years
The Hubble telescope has recorded a new view of the "Necklace" nebula, the remnants of a star that aged and expanded, consuming a companion star that orbited it. In this composite image, shot on July 2, 2011, hydrogen gas is blue, oxygen is green, and nitrogen is red.
NASA, ESA, and the Hubble Heritage Team (STScI/AURA)
Celestial Sightings: What Was in the Sky?
The sun gave off the largest solar flare in five years on Aug. 9, 2011, sending a mass of charged particles into space. It was not pointed toward Earth, which is protected anyhow by its atmosphere and strong magnetic field, but scientists say the sun is becoming more active after a long quiet period.
NASA/Solar Dynamics Observatory
Sky Sightings: Eclipse, Aurora and More
Lunar eclipse of June 15, 2011, visible from Africa and Asia was shown on Google's homepage.
The upside-down rainbow, or circumzenithal arc, is a visual effect similar to normal rainbows, except that it only takes shape when the sun is lower than 22 degrees radius over the horizon.