L’ottima fonte stukhtra, sta pubblicando giornalmente un particolare calendario dell’avvento.

Queste sono solo due delle immagini, e relative informazioni, che mi sono piaciute di più finora.

In the upper right of this image is part of NGC 4921, an unusual spiral galaxy in the Coma Galaxy Cluster some 320 million light-years from Earth. […] All around, and even through the galaxy itself, thousands of much more remote galaxies of all shapes, sizes and colours are visible. Many have the spotty and ragged appearance of galaxies at a time before the familiar division into spirals and ellipticals had become established. This image was created from 50 separate exposures. Fonte originale

While hunting for volcanic plumes on Io, the Hubble telescope captured these images of the volatile moon sweeping across the giant face of Jupiter in 1999. Io appears to be skimming Jupiter’s cloud tops, but it’s actually 500,000 km away. The conspicuous black spot on Jupiter is Io’s shadow and is about the size of the moon itself (3,640 km). This shadow sails across the face of Jupiter at 17 km per second.