X-rays from Sirius B, 6 October 2000.


X-rays from Sirius B, 6 October 2000.
3 3 c m
actual image size: 32cm x 25cm


X-ray image from the Chandra Observatory showing Sirius B, a small companion star to Sirius A (Alpha Canis Majoris) the brightest star in the sky. Sirius B, although hotter, is much smaller and dimmer, and was not sighted until 1862. Sirius A and B are part of a a binary star system eight light-years away from Earth. Sirius B is the closest known white dwarf star; its surface temperature is 25,000 kelvins, its mass is the same as that of the Sun, and its radius is slightly less than taht that of the Earth's.

© Science Museum / Science & Society Picture Library

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