Astronomy Picture of the Day Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2017 May 28 Explanation: What's happened in Hebes Chasma on Mars? Hebes Chasma is a depression just north of the enormous Valles Marineris canyon. Since the depression is unconnected to other surface
![APOD: 2017 May 28 - Collapse in Hebes Chasma on Mars](https://cdn-ak-scissors.b.st-hatena.com/image/square/da1c9b2dec7d7ff1eda1b0718877a36f05fe4b43/height=288;version=1;width=512/https%3A%2F%2Fapod.nasa.gov%2Fapod%2Fimage%2F1705%2FHebesChasma_esa_960.jpg)