The six-wheeled Curiosity rover is NASA’s rock star. Since August 2012, when it landed in Gale Crater on Mars, it has been spending its days (or “sols” on Mars) hunting for environments where past life might have thrived. It has traveled about 10 kilometers, drilled into six rocks, analyzed three scoops of dirt and revealed the watery history of its landing site. As Curiosity begins to climb a mountain for some vertical geologizing, Science News imagined key entries from the rover’s personal diary, logged as the 1-ton machine made its way across the Martian landscape. Each excerpt opens with a tweet actually posted by NASA on Curiosity’s behalf at the Twitter name @MarsCuriosity.