Mars Reconnaissance Orbiter

MRO

Agency

NASA

Country

🇺🇸 USA

Launched

2005-08-12

Status

Ongoing

Mass

2,180 kg

Instruments

6 science instruments

HiRISE camera (25 cm resolution), CTX context camera, CRISM mineral mapper, MCS climate sounder, SHARAD subsurface radar, MARCI weather camera

Orbit

Nearly circular polar sun-synchronous orbit, ~300 km altitude, 112-minute period

Key Findings

1.HiRISE camera resolves surface features down to 25 cm — unprecedented resolution for any Mars mission and the benchmark for all subsequent landing site assessments
2.CRISM identified over 1,000 distinct water-altered mineral deposits including phyllosilicates, chlorides, and carbonates across the ancient terrain
3.CTX and HiRISE confirmed recurring slope lineae (RSL) — dark seasonal streaks interpreted as possible brine flows or dry granular avalanches
4.Serves as the primary high-bandwidth data relay for Curiosity and Perseverance, downlinking terabytes of rover science data annually

Mission Outcome

Mars Reconnaissance Orbiter has been the backbone of NASA's Mars communication infrastructure since 2006 and remains operational in 2026. Its HiRISE camera has transformed surface science and enabled the pin-point landing of Curiosity, InSight, and Perseverance. The spacecraft has returned more data from Mars than all other missions combined.

Sources

[1] NASA Mars Exploration Program — retrieved 2026-06-01
“MRO has returned more data about Mars than all other spacecraft combined. Studying Mars' atmosphere and terrain from orbit since 2006.”
[2] NASA NSSDCA — retrieved 2026-06-01

← All Mars Orbiters