How Perseverance Hunts for Life: The Scan, Analyze, Sample Workflow Aboard NASA's Mars Rover

NASA's Perseverance rover employs a systematic scan-analyze-sample workflow to search for signs of ancient microbial life on Mars, using advanced instruments for landscape surveying, remote chemical analysis, close-up investigation, and caching compelling samples for potential return to Earth.

Dr. Evelyn Reed

October 18, 2026 · 5 min read

NASA's Perseverance rover searches for signs of past microbial life through a deliberate, multi-stage workflow: survey the landscape with zoomable cameras, probe promising rocks with a mast-mounted laser, examine targets at microscopic scale with arm instruments, and cache the most compelling samples for eventual return to Earth. Rather than a single life-detection experiment, the rover functions as a remote laboratory in which each instrument's findings guide the next step of the investigation.

Perseverance's Mission: The Search for Ancient Martian Life

A key objective for Perseverance, as NASA states, is astrobiology, including the search for signs of ancient microbial life. Unlike its predecessor Curiosity, the Mars 2020 rover was designed to focus on fine-grained mineralogy to help it detect biosignatures and understand how ancient habitats changed over time, according to The Planetary Society's coverage of NASA's instrument selections. The mission also carries a second, equally consequential task: collecting and storing samples of the Martian surface that could be returned to Earth.

The strategy has already produced results. In summer 2024, Perseverance investigated what one mission scientist called its "most puzzling, complex, and potentially important rock yet," a target nicknamed Cheyava Falls that showed signs of past water, organic material, and clues suggesting chemical reactions by microbial life. In September 2025, after a yearlong peer review, the journal Nature published validated results showing the "Sapphire Canyon" sample from that rock contains potential biosignatures — clues that suggest past life may have been present, but that require more data before any conclusion about the presence or absence of life.

Perseverance Rover's Astrobiological Investigation Workflow

The sequence below models the scan-analyze-sample strategy as it was actually executed at Cheyava Falls, ordered by observation scale — from landscape to microscopic — and analytical capability. Each stage's output determines the next stage's input.

Perseverance's multi-stage workflow from landscape survey to sample collection
Stage	Key Instruments	Action Performed	Scientific Goal
1. Landscape survey	Mastcam-Z (mast)	High-resolution multispectral panoramas and stereo imaging; spot features like the leopard spots	Identify promising targets and geological context
2. Remote analysis	SuperCam (mast)	Laser-induced breakdown spectroscopy and acoustic detection of rock composition from a distance	Gather initial chemical clues; triage targets
3. Close-up analysis	SHERLOC, WATSON, PIXL (arm); RIMFAX (radar)	Raman and UV fluorescence mapping of organics and minerals; microscopic context imaging; X-ray elemental mapping; subsurface radar	Detect organic molecules, minerals, and textures that may constitute a biosignature
4. Sample collection	Robotic arm and coring system	Core the target rock — as with the Sapphire Canyon core — and cache it	Preserve promising material for potential return to Earth

This is a strategic deployment rather than a rigid, always-identical sequence: the instruments work in concert, with data from one informing where and how the next is used, and the mission team's judgment governs each decision point.