Level 1 — Absolute Beginner
NASA has a robot car on Mars called Perseverance. It looks for signs of old life.
The robot found many small bits of carbon in rocks. Carbon is something found in all living things on Earth.
The rocks are in a place called Jezero Crater, where a river used to flow long ago.
This does not prove life was on Mars. But it shows the building blocks of life may have been there.
- robot
- a machine that can do tasks, sometimes by itself
- Mars
- the fourth planet from the sun, often called the Red Planet
- carbon
- a chemical element found in all living things
- crater
- a large bowl-shaped hole in the ground, often made by a space rock hitting it
- river
- a large stream of water that flows across land
- prove
- to show with facts that something is true
- building block
- a basic part that is used to make something bigger
- instrument
- a tool used to measure or study something
Level 2 — Elementary
NASA's Perseverance rover has discovered its largest amount yet of complex organic molecules on Mars, made up of carbon atoms similar to those found in living things on Earth.
The rover found these signals in ancient river rocks at a spot called the Bright Angel formation, located inside Jezero Crater, which scientists believe once held a lake fed by a river.
Perseverance used a tool called SHERLOC, attached to its robotic arm, to detect hundreds of these carbon signals across several rocks.
This discovery does not prove that life ever existed on Mars, but it does support the idea that the chemical ingredients needed for life may have once been common across the planet.
- organic molecule
- a chemical structure built mainly from carbon atoms, often linked to living things
- atom
- a tiny particle that makes up all matter
- formation
- a distinct layer or structure of rock formed over time
- lake
- a large body of water surrounded by land
- robotic arm
- a mechanical arm on a machine, used to reach and examine objects
- detect
- to discover or notice the presence of something
- ingredient
- one of the parts or elements that make up something
- common
- found often or in many places
Level 3 — Intermediate
NASA's Perseverance rover has uncovered the most extensive evidence yet of complex organic molecules on Mars, detecting macromolecular carbon, large tangled networks of carbon atoms, in mudstones from the Bright Angel formation within Jezero Crater.
Using its SHERLOC instrument, mounted on the rover's robotic arm, the science team logged hundreds of organic detections across several rocks in Neretva Vallis, an ancient river channel that once fed Jezero's paleolake.
The findings, published in the journal Science Advances, represent an organic-bearing site more than 3,500 kilometers from previous organic detections made by NASA's Curiosity rover in Gale Crater, suggesting that such chemistry may have been widespread across ancient Mars.
Researchers caution that macromolecular carbon can form through either biological or non-biological processes, so the discovery does not confirm past life, but it does strengthen the broader case that Mars may once have offered the chemical conditions needed for habitability.
- macromolecular carbon
- large, complex networks of carbon atoms that can come from living or non-living sources
- mudstone
- a type of rock formed from hardened mud or clay
- paleolake
- an ancient lake that no longer exists in its original form
- organic-bearing
- containing carbon-based compounds, often linked to biological material
- biological process
- a natural process that occurs within or is produced by living organisms
- non-biological
- not related to living organisms; occurring through chemical or physical means alone
- habitability
- the ability of an environment to support life
- confirm
- to establish something as true with certainty
Level 4 — Advanced
NASA's Perseverance rover has returned the most extensive evidence to date of complex organic chemistry on Mars, identifying macromolecular carbon, expansive and tangled networks of carbon atoms, embedded within mudstones of the Bright Angel formation inside Jezero Crater.
Deploying its SHERLOC spectrometer, affixed to the rover's robotic arm, the mission's science team logged hundreds of discrete organic signatures across multiple rock targets within Neretva Vallis, a fossilized river channel that once fed the crater's paleolake during a wetter Martian epoch.
Published in Science Advances, the findings document an organic-bearing locality situated more than 3,500 kilometers from the site of Curiosity's earlier organic detections in Gale Crater, a geographic separation that researchers argue implies such chemistry may have been geographically widespread rather than confined to an isolated pocket.
Investigators are careful to note that macromolecular carbon arises through both abiotic and biotic pathways, meaning the detection cannot by itself adjudicate the question of ancient life, though it meaningfully reinforces the broader inference that early Mars possessed the chemical raw materials a habitable environment would have required.
- spectrometer
- an instrument used to measure and analyze the properties of light or chemical composition
- discrete
- individually separate and distinct
- fossilized
- preserved from an earlier time, often in a hardened or unchanging form
- epoch
- a distinct period of time in history or geology
- locality
- a particular place or specific area
- geographic separation
- the physical distance between two places
- abiotic
- not involving or produced by living organisms
- adjudicate
- to make a formal judgment or decision about a disputed matter
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