NASA’s SPHEREx observatory undergoes testing at BAE Systems in Boulder, Colorado, in August 2024. Launching no earlier than Feb. 27, 2025, the mission will make the first all-sky spectroscopic survey in the near-infrared, helping to answer some of the biggest questions in astrophysics. Credit: BAE Systems/NASA/JPL-CaltechShaped like a megaphone, the upcoming mission will map the entire…