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Many scientific terms are very specific, but the term nebula is, well, nebulous. In a very generic sense, it simply means a fuzzy thing. But there are a wide variety of astronomical objects that can ...

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Forbes contributors publish independent expert analyses and insights. An award-winning reporter writing about stargazing and the night sky. It’s one of the most common words used by astronomers—and ...

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The universe is a slow-changing place. While it's mostly true that the heavens and the deep-sky objects in it will look largely the same across an average human lifetime, there are dramatic examples ...

Nebulous age In the Ask Astro column of the April 2026 issue is a photograph of planetary nebula NGC 6302. The caption says ...

As the energized electrons revert from their higher-energy state to a lower-energy state by recombining with atoms, they emit energy in the form of light, causing the nebula’s gas to glow. A famous ...

Emission nebulae are glowing clouds of interstellar gas excited by hot, young stars within their folds. Because much of the emitted light is caused by intense ultraviolet radiation stripping electrons ...

Astroimaging involves a profound irony. While the goal of photography is to capture light, the majority of what astrophotographers capture in their images is utter darkness. Oh sure, the intended ...