Hopes linger for Mars methane.

The article focuses on the European Space Agency (ESA) mission to map methane sources as a precursor to send rover which will look for Martian life. It states that the Mars rover Curiosity team performed four tests with the Tunable Laser Spectrometer (TLS), the rover instrument with an essential role in looking for the gas. It says that the orbiter will map the global distribution of gases through the light reflected from the Martian surface.