This map shows the global distribution of volunteers.
Here’s a list of scientific publications resulting from Zooniverse activities: Zooniverse Publications.
A posting on the Planet Hunters blog about the milestone : 15 percent of 1 million – Planet Hunters
This accomplishment is yours too. Our estimate is over 280,000 people world wide (unregistered and registered volunteers) have participated in Planet Hunters. 150,000 registered Zooniverse volunteers have classified at least one Planet Hunters light curve. Roughly 15% of the 1 million registered Zooniverse volunteers have contributed to Planet Hunters science. That’s a huge representation!