Hubble Constant andHubble Constant andCosmic Expansiongrasp of the universe's expansion.Research on HII regions enhances ourCosmology and Nongalactic AstrophysicsMeasuring the Expanding Universe: The Hubble ConstantA look at how HII regions help measure the Hubble constant.2025-09-10T07:34:27+00:00 ― 6 min read