Titan Mare Explorer (
TiME) is a proposed design for a
lander for Saturn's moon
Titan. TiME is a relatively low-cost, outer-planet mission designed to measure the
organic constituents on Titan and would have performed the first
nautical exploration of an extraterrestrial sea, analyze its nature and, possibly, observe its shoreline. As a Discovery-class mission it was designed to be cost-capped at US$425 million, not counting launch vehicle funding. It was proposed to
NASA in 2009 by Proxemy Research as a scout-like pioneering mission, originally as part of NASA's
Discovery Program. The TiME mission design reached the finalist stage during that Discovery mission selection, but was not selected. Although TiME got another possibility in late 2013 to obtain funding, NASA has since cancelled the development of the power source that would be required,
advanced Stirling radioisotope generators.