I wonder how long before another one is discovered? Maybe it will be like Exoplanets. Once the first was found new discoveries have been almost exponential.
For those of us not familiar with ngc4254 (M99) here's a couple of images courtesy of the NGC/IC Project at http://www.ngcic.org/
Star Trek Meets Astronomy Eh
Thanks for the picture Paul, it shows the distended arm of M99 very well.
Another Hidden force seen ! for the first time in human history