# Observing the Inner Shadow of a Black Hole: A Direct View of the Event Horizon

> Research article (The Astrophysical Journal, 2021) · cited 177× · AI/ML

**Wikidata**: [openalex:W3170133809](https://www.wikidata.org/wiki/openalex:W3170133809)  
**Source**: https://4ort.xyz/entity/observing-the-inner-shadow-of-a-black-hole-a-direct-view-of-the-event-horizon