The LISA spacecraft is based on a short cylinder 1.8 meters in diameter and 0.5 meter high. The cylinder supports a Y-shaped tubular structure that contains two instruments. During science operations, the Sun will be 30 degrees from the normal to the top of the cylinder. Solar panels will be mounted on a sunshield that extends out from the top of the structural cylinder and keeps sunlight off the cylinder wall. A cover across the top of the cylinder (not shown) will prevent sunlight from striking the Y-shaped structure. The Y-shaped structure is gold-coated and suspended by stressed-fiberglass bands to thermally isolate it from the spacecraft. The spacecraft and Y-shaped structure are made of a graphite-epoxy composite chosen for its low coefficient of thermal expansion. Two 30-centimeter-diameter X-band radio antennas (not shown) will be mounted to the outside of the spacecraft for communication with Earth. High Resolution (TIF - 9.6 MB)