Mars-caused changes in Earth’s orbit impacts ocean currents and temperatures every 2.4 million years and is known as an “astronomical grand cycle.” Anyone with an inkling of knowledge of geologic history appreciates Earth’s climate is constantly changing. This change has many reasons, including solar cycles, volcanic activity, and asteroids. New research shows another potentially significant player in Earth’s climate change cycles: Mars, our neighboring planet. Geological evidence tracing back more than 65 million years and taken from hundreds of sites across the world suggests that deep-sea currents have repeatedly gone through periods of being either stronger or weaker. This happens...