Water is essential for life on Earth and other planets, and scientists have found ample evidence of water in Mars' early history. But Mars has no liquid water on its surface today. New research from Washington University in St. Louis suggests a fundamental reason: Mars may be just too small to hold onto large amounts of water.
The American SpaceX company has stacked the biggest rocket ever constructed .The vehicle's two segments - an upper-stage called Starship and a booster called Super Heavy - were connected together at the firm's Starbase R&D facility in Boca Chica, Texas. Standing roughly 120m (400ft) in height, the SpaceX rocket dwarfs any previous launch system.