Mars Mission: Exploring the Red Planet

A: Commanding a stuck valve again and again risks actuator burnout and leaves the feed path unusable for the rest of the mission. Cold welding in vacuum explains the inrush current, the brief motion, and the total lack of pressure response; the motor sees load then stalls. A mis-set limit switch would still allow flow, chafing would drop current rather than spike it, and a clogged filter would show some pressure increase even if flow is low.

A: Choosing the wrong alloy can mean cracked bolts after thermal cycling, and there’s no EVA to fix it. Trace moisture plus tensile stress makes stress corrosion cracking credible even in a dry environment, especially over long durations. Chloride pitting needs sustained liquid films, hydrogen embrittlement needs active electrochemistry, and abrasion alone doesn’t explain delayed brittle failure.

A: Forcing the machine harder cooks bearings and seals, ending the campaign early. Backing off flow reduces compression work and temperature while staying inside the map. Speeding up worsens fouling effects, venting wastes precious product and risks dust ingress, and higher pressure only raises discharge temperature further.

A: A wrong sensor choice means drifting readings and bad propellant management. A rad-hard MEMS absolute device is built for low pressures and radiation. Mechanical gauges don’t like launch loads, automotive MAP sensors aren’t rated for radiation or vacuum, and a differential device tied to cabin pressure fails once the reference changes.