© NASA, GSFC.
The Joint Dark Energy Mission, or JDEM, is a joint effort by NASA and the Department of Energy to make better observations of the universe that will enhance our understanding of dark energy. Scheduled to launch in 2016, the JDEM Dark Energy Space Telescope will be equipped with a powerful instrument suite capable of wide-field imaging and spectroscopy in both the visible wavelength range and the infrared. The telescope will be used to survey type Ia supernovae, weak gravitational lensing, and the clustering of galaxies. These three measurements, taken together, can provide the key to distinguishing between different models of dark energy. (Unit: 11)