Posted on September 21, 2008 by BrianBuckle Up Ponder the dandelion seed. Blows light. Blows far. Done well, attached to our ship, a dandelion sail at 300 km/sec = 300,000 m/sec = 3.0 x 10^5 m/sec = 1/1,000 the speed of light would take 4,300 years to make it to Alpha Centauri. [wiki] Not bad.