When an unexpected visitor from deep space was discovered in early July 2025, among the biggest mysteries were: What is it? and How big is it? Hubble observations helped answer these questions. The interstellar vagabond, 3I/ATLAS, behaves like a comet. Hubble sent back crisp pictures of a teardrop-shaped cocoon of dust coming off the comet towards the Sun, then blown back by sunlight.As NASA Missions Study Interstellar Comet, Hubble Makes Size Estimate
August 14, 2025
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When an unexpected visitor from deep space was discovered in early July 2025, among the biggest mysteries were: What is it? and How big is it? Hubble observations helped answer these questions. The interstellar vagabond, 3I/ATLAS, behaves like a comet. Hubble sent back crisp pictures of a teardrop-shaped cocoon of dust coming off the comet towards the Sun, then blown back by sunlight.
