Site of a Federation human colony of 20 million where the resulting dust from an asteroid's impact in 2368 blocked over 80 percent of the incoming sunlight and threatened eco-disasters, including a temperature drop of 10-12 degrees C. in the first 10 days and two tropical rivers beginning to freeze. The U.S.S. Enterprise NCC-1701-D is finally able to ionize the atmospheric ash and dust into plasma that is deflected into space.