Sirius B from HST and Chandra

The Sirius system. Left panel: The white dwarf Sirius B is barely visible in this optical image from HST. The main sequence star A is much brighter because while A is larger than the Sun, B is only about as big as Earth. Right panel: the view changes with A being only seen by leakage of its far-UV radiation on to the detector, while B is extremely bright, hot enough to emit low energy X-rays.

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