NASA plans to delay the next phase of its Mars Sample Return campaign and split a lander mission into two separate spacecraft to reduce the overall risk of the program. At a March 21 meeting of the National Academies’ Space Studies Board, Thomas Zurbuchen, NASA associate administrator for science, revealed that NASA and the European Space Agency had agreed to revise the schedule and design for upcoming missions that will return samples being cached by the Perseverance rover to Earth. Original plans called for the launch of both a NASA-led Sample Retrieval Lander and ESA-led Earth Return Orbiter in 2026....