Expedition Six NASA ISS Science Officer Don Pettit performs a series of microgravity experiments with water spheres and effervescent antacid tablets. Pettit inserts a tablet into a 50-millimeter sphere and observes the fizzy results.
Here is some jaw-dropping time-lapse footage of the eruption of the Eyjafjallajökull volcano over the first two days of May:
See also Pictures of Eyjafjallajökull for some images of the lightning-filled initial eruption.
From NASA APOD:
Sculpted by stellar winds and radiation, a magnificent interstellar dust cloud by chance has assumed this recognizable shape. Fittingly named the Horsehead Nebula, it is some 1,500 light-years distant, embedded in the vast Orion cloud complex. About five light-years “tall”, the dark cloud is cataloged as Barnard 33 and is visible only because its obscuring dust is silhouetted against the glowing red emission nebula IC 434. Stars are forming within the dark cloud. Contrasting blue reflection nebula NGC 2023, surrounding a hot, young star, is at the lower left. The gorgeous color image combines both narrowband and broadband images recorded using three different telescopes.
Credit: Marco Burali, Tiziano Capecchi, Marco Mancini (Osservatorio MTM)
From NASA APOD:
Some 60 million light-years away in the southerly constellation Corvus, two large galaxies collided. But the stars in the two galaxies cataloged as NGC 4038 and NGC 4039 don’t collide in the course of the ponderous, billion year or so long event. Instead, their large clouds of molecular gas and dust do, triggering furious episodes of star formation near the center of the cosmic wreckage. Spanning about 500 thousand light-years, this stunning view also reveals new star clusters and matter flung far from the scene of the accident by gravitational tidal forces. Of course, the visual appearance of the far-flung arcing structures gives the galaxy pair its popular name - The Antennae.
Credit: Star Shadows Remote Observatory and PROMPT/CTIO (Jack Harvey, Steve Mazlin, Rick Gilbert, and Daniel Verschatse)