A new study published in Science provides clear evidence of organic matter on…
2026
A new study published in Science provides clear evidence of organic matter on Mars’s surface. NASA’s rover Curiosity collected data, confirming old riverbeds that suggest carbon-based compounds essential for life. These organic molecules were found in Gale Crater, an area that may have been a lake over three billion years ago. The rocks containing the organics also had sulfur, which might have preserved them despite harsh surface radiation. While the presence of organic molecules doesn’t prove ancient life—since they could form through non-living processes—it’s a significant discovery. About five years ago, Curiosity also detected methane, a basic organic molecule and natural gas component, in the Martian atmosphere. Methane only lasts a few hundred years, suggesting an unknown source replenishes it. Its levels fluctuate seasonally, possibly due to underground icy crystals releasing gas.
These findings indicate Mars is more active than thought and might be becoming more habitable. Future missions, like ESA’s Exo Mars and NASA’s Mars Rover, aim to explore the soil and atmosphere further, potentially answering if life ever existed on Mars.
Identify the central theme of the passage.
- A.
Searching for water on Mars
- B.
Discovery of organic matter and its implication for life on Mars
- C.
Technical features of the Mars Rover
- D.
Mars' atmospheric changes
Attempted by 2 students.
Show answer & explanation
Correct answer: B
To identify the central theme of the passage, we must analyze the main subject and the primary conclusion being drawn.
Passage Analysis
Key Findings: The passage details the discovery of organic matter and methane on Mars by NASA's Curiosity rover.
Context: These findings are placed within the context of Gale Crater (a past lake) and seasonal atmospheric changes.
Significance: The overarching point is that these findings suggest Mars is more active and potentially more habitable than previously thought, furthering the search for evidence of past life.
Conclusion
The central theme is the discovery of organic matter and its implication for life on Mars (Option 2).