1. Payload and Mobility • Measure 15 samples in the dark and 5 samples in light. The Viking Lander did not move, but it used an SSRA with a boom, collector head, and shroud unit, capable of collecting a variety of material elements. • Each sampling site separated by 500 m. The Viking Lander did not have this capability. • Determine composition, geotechnical properties, and volatile content of regolith. The Viking Lander used an X-ray Fluorescent Spectrometer (XRFS) to perform a chemical analysis. • Enhanced geological characterization (multispectral imager & remote sensing instrument). The XRFS plus a remote sensing instrument may be used for this function.

2. Observation • Viking Lander camera system • Looked at surface and was able to measure optical density of the atmosphere • Geologically characterize the surface • Look for macroscopic evidence of life • LETS camera system • Observe electrostatic dust on the horizon • Study change in lighting conditions and the effects of surrounding environment • Aid in Earth observation and control of data collection

3. Communication and Data Transmission • Transmission options • Direct transmission used by Viking • Relay from Viking Orbiter to Earth • DAPU to convert data • UHF linked used to transmit data at speeds of 4000 and 16000bps • Transmission Criteria for LETS • => 1 Earth day to transmit data • Limit of no slower than 4000bps • Same instrumentation to substitute from Viking • Transmission Path Options • Direct transmission on the Moon to Earth in sunlight • Storage of data until sunlight is reached • Lunar orbiter to relay data to earth