Telescope Provides Tool for Unraveling Dark Energy

Radio astronomers have directly measured the distance to a faraway galaxy, providing
a valuable "yardstick" for calibrating large astronomical distances and demonstrating a
vital method that could help determine the elusive nature of the mysterious Dark Energy.

http://www.alienskys.com/2009/Telescope_Provides_Tool_for_Unraveling_Dark_Energy_2637.html