Planets

• The James Webb Space Telescope has identified two pairs of "JuMBOs" (Jupiter-mass binary objects) within a star-forming region of the Milky Way. • These rogue, planet-sized objects exist without orbiting a parent star, challenging previous theories that such sightings were merely optical illusions. • This discovery is significant because it contradicts standard models of planet formation, which typically require a host star to create such bodies.

• NASA announced in December 2025 that construction of the Nancy Grace Roman Space Telescope is complete, with a scheduled launch by May 2027 or potentially as early as fall 2026. • During its five-year primary mission, the observatory aims to discover approximately 100,000 new transiting planets and create the largest catalog of rogue worlds in history. • This mission is significant because it will drastically expand the known exoplanet population and provide unprecedented data on planets drifting without host stars.