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The Astro2010 Decadal Survey recommended a Wide Field Infrared SurveyTelescope (WFIRST) as its top priority for a new large space mission. Thereport of the WFIRST-AFTA Science Definition Team (SDT) presents a DesignReference Mission for WFIRST that employs one of the 2.4-m, Hubble-qualitymirror assemblies recently made available to NASA. The 2.4-m primary mirrorenables a mission with greater sensitivity and higher angular resolution thanthe smaller aperture designs previously considered for WFIRST, increasing boththe science return of the primary surveys and the capabilities of WFIRST as aGuest Observer facility. The option of adding an on-axis, coronagraphicinstrument would enable imaging and spectroscopic studies of planets aroundnearby stars. This short article, produced as a companion to the SDT report,summarizes the key points of the WFIRST-2.4 DRM. It highlights the remarkableopportunity that the 2.4-m telescope affords for advances in many fields ofastrophysics and cosmology, including dark energy, the demographics andcharacterization of exoplanets, the evolution of galaxies and quasars, and thestellar populations of the Milky Way and its neighbors.

WFIRST-2.4: What Every Astronomer Should Know