http://www.nasa.gov/mission_pages/galex/20070815/a.html
The Galaxy Evolution Explorer discovered Mira's strange comet-like tail during part of its routine survey of the entire sky at ultraviolet wavelengths. When astronomers first saw the picture, they were shocked because Mira has been studied for over 400 years yet nothing like this has ever been documented before.
Mira's comet-like tail stretches a startling 13 light-years across the sky. For comparison, the nearest star to our sun, Proxima Centauri, is only about 4 light-years away. Mira's tail also tells a tale of its history ?€“ the material making it up has been slowly blown off over time, with the oldest material at the end of the tail having been released about 30,000 years ago.
- Hank
