The long form of the mission's name is Interior Exploration using Seismic Investigations, Geodesy and Heat Transport, which includes the three main research techniques to be used by the InSight stationary lander. A dictionary definition of "insight" is to see the inner nature of something.
InSight Lander Dimensions
Height range (after its legs compress a still-to-be-determined amount during impact): between 33 to 43 inches (83 to 108 centimeters) from the bottom of the legs to the top of the deck; span with solar arrays deployed: 19 feet, 8 inches (6.00 meters); width of deck: 5 feet, 1 inch (1.56 meters); length of robotic arm: 5 feet, 11 inches (1.8 meters)
Diameter: 39 feet (11.8 meters). Suspensions lines: 40 in total, which tie into 10 risers. Mortar canister: 1; the parachute trails the mortar by about 65 feet (20 meters). Peak load: Up to 15,000 pounds per foot (22,000 kilograms per meter)
Dimensions: 8 feet, 8 inches wide (2.64 meters). Backshell and heat shield weight: 419 pounds (190 kilograms). Composition: The heat shield is made of Lockheed Martin’s SLA-561V (Super Lightweight Ablator 561V) thermal protection material. This material is primarily made up of crushed cork. SLA-561V was developed and used on the Viking missions in 1976 and for every NASA Mars surface mission with the exception of Curiosity and the upcoming Mars 2020 mission. Though based on the Phoenix Lander design, the InSight heat shield is slightly thicker than the one used for the Mars Phoenix mission.
About 1,530 pounds (694 kilograms) for the entire InSight spacecraft at launch. The spacecraft includes the lander, which is about 789 pounds (358 kilograms), the 417-pound (189-kilogram) aeroshell, 174-pound (79-kilogram) cruise stage and 148 pounds (67 kilograms) of loaded propellant and pressurant. Mass of each MarCO spacecraft: 29.8 pounds (13.5 kilograms). Total payload mass on the rocket: 1,590 pounds (721 kilograms)
Solar panels and lithium-ion batteries are on both InSight and MarCO. On InSight, the two solar array panels together provide about 1,300 watts on Earth on a clear day. On Mars, they provide 600-700 watts on a clear day, or just enough to power a household blender. They’re estimated to provide 200-300 watts on a dusty day, even with some dust covering the panels.
InSight Science Payload
About 110 pounds (50 kilograms), including Seismic Experiment for Interior Structure, Heat Flow and Physical Properties Package, Auxiliary Payload Sensor Suite, Instrument Deployment System and Laser Retroreflector. (The Rotation and Interior Structure Experiment uses the lander’s telecommunications system.)
Mars Cube One (MarCO) dimensions:
Twin spacecraft, each 14.4 inches (36.6 centimeters) by 9.6 inches (24.3 centimeters) by 4.6 inches (11.8 centimeters).
One pointable camera on InSight’s robotic arm and one fixed, wide-angle camera under the spacecraft’s lander deck are both capable of producing color images of 1,024 pixels by 1,024 pixels. MarCO-A and B each have a wide-field camera (primarily to confirm high-gain antenna deployment) capable of color images of 752 pixels by 480 pixels in resolution.
Both MarCO CubeSats were also designed with a narrow-field-of-view camera, but MarCO-A’s narrow-field camera was found to be inoperable prior to launch.