NASA's Curiosity Rover Measures Intriguing Carbon Signature on Mars
By William Steigerwald
Newly discovered carbon may yield clues to ancient Mars
By Andrea Elyse Messer & Elyse Messer
Mars Was Likely A Cold, Wet World 3 Billion Years Ago
By Alfredo Carpineti
Chilly, damp Mars may have hosted an ancient ocean
By Charles Choi
Ancient life may be just one possible explanation for Mars rover's latest discovery
By Ashley Strickland
Nasa detects signs of past life on Mars
By Anugraha Sundaravelu