Rank 94 documents the Interstellar Boundary Explorer (IBEX) — the Southwest Research Institute Explorers mission air-launched from Kwajalein Atoll on 19 October 2008 aboard a Pegasus XL rocket and weighing just 107 kg while producing the first global map of the heliosphere boundary in energetic neutral atoms. David McComas and Nathan Schwadron led IBEX-Hi and IBEX-Lo sensors that discovered an unexpected bright ENA ribbon where the solar wind meets the interstellar medium — a structure theorists are still explaining. IBEX's highly elliptical 86,000 km apogee orbit keeps the spacecraft outside most radiation belts, optimizing ENA collection with minimal mass. Extended missions through the 2020s proved small spacecraft could carry big heliophysics per kilogram. Wallimilist renders the octagonal bus with dual sensor apertures against a stippled ENA ribbon arc, Pegasus XL kicker, and Kwajalein launch footer exactly as the master PNG dictates.