Astronomy Picture of the Day

Explanation: Scroll right and fly close over asteroid Eros! This long mosaic was constructed of images returned yesterday by the NEAR Shoemaker spacecraft as it orbited to within 6.4 kilometres of a spot in the southern hemisphere of the rotating asteroid's surface. That distance (about 21,000 feet) is less than the cruising altitude of most commercial airline flights. The digital images show that while many regions appear smooth with craters filled in by an accumulation of loose regolith, much of Eros' surface is littered with rocks and boulders. The large boulder glinting in the sunlight at the far left, just above the centre of the mosaic, spans approximately 25 metres. In the high-resolution view, the smallest rocks visible are roughly human-sized at about 1.4 metres (5 feet) across. The car-sized Near Shoemaker spacecraft is now on its way to a higher, more stable orbit about 200 kilometres above asteroid Eros.