Graham and his research team analyzed X-ray observations from the Chandra X-ray Observatory along with visible observations from Hubble. Something that made them suspicious when looking at the X-ray data was the hotspot near the center, but not exactly at the center, of NGC 4424. Hotspots like this — scorching gas surrounding a galaxy’s black hole — are usually found right in the centers of most larger galaxies. Visible light eyed by Hubble factored into modeling and calculations that then revealed a star cluster reaching towards the center of NGC 4424.
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