JWST Spots Carbon-Helium ‘Space Lemon’ Orbiting a Pulsar

Astronomers last saw planets around pulsars in 1992 (PSR B1257+12), but those Earth-mass worlds showed conventional compositions; PSR J2322-2650b’s carbon-helium shroud echoes the 2011 ‘diamond planet’ PSR J1719-1438 b yet pushes the anomaly farther by retaining Jupiter mass and active atmosphere. The find sits at the crossroads of two long arcs: telescopic sensitivity—from Hubble’s first exoplanet transits in 1999 to JWST’s infrared spectra—shifts discovery from mere detection to chemical forensics, and theorists must now accommodate planetary survival in extreme post-supernova environments. If pulsar-orbiting gas giants with exotic chemistries exist, the canonical star-disk accretion narrative (a 4.6-billion-year-old idea tracing to Laplace) is incomplete. On a century horizon, such outliers may refine models of matter segregation, nucleosynthesis remnants, and even diamond formation physics, or they may remain statistical curiosities reminding us that sample bias—not nature—limits theory.