2026-06-05
The Hydra Cluster of Galaxies
Today's window into deep space — The Hydra Cluster of Galaxies. The story behind the image:
Why this matters
Today's highlight centers on deep-space objects. Understanding how these objects form and move is the bridge between a pretty photo and the live, data-driven sky we render on the globe.
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The science, from NASA's Astronomy Picture of the Day
Within our own Milky Way galaxy, two bright, spiky stars stand like sentinels in the foreground of this cosmic snapshot. Far beyond them are the galaxies of the Hydra Cluster. In fact, while the spiky foreground stars are hundreds of light-years distant, the Hydra Cluster galaxies are well over 100 million light-years away. Three large galaxies near the cluster center, two yellow ellipticals (NGC 3311, NGC 3309) and one prominent blue spiral (NGC 3312), are the dominant galaxies, each about 150,000 light-years in diameter. An intriguing overlapping galaxy pair cataloged as NGC 3314 lies above and left of NGC 3312. Also known as Abell 1060, the Hydra galaxy cluster is one of three large galaxy clusters within 200 million light-years of the Milky Way. In the nearby universe, galaxies are gravitationally bound into clusters which themselves are loosely bound into superclusters. Superclusters in turn are seen to align over even larger scales.
Image credit: Rafael Sampaio · Source: NASA APOD
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