A small, icy world orbiting beyond Neptune has no business holding onto an atmosphere. It is too small, too cold, and too far from the sun. Yet observations published in May 2026 in Nature Astronomy ...

If confirmed, the rock would become just the second world past Neptune in our solar system to host an atmosphere.

A newly discovered distant mini-Neptune planet may possess its own atmosphere, ocean, or a combination of the two, even if they don't last for long. The extrasolar planet, or exoplanet, designated ...

The atmosphere is between 5 million and 10 million times thinner than Earth's atmosphere. A very small body, far from the sun in an icy outer realm of the solar system, has mysteriously grown an ...

WASHINGTON (Reuters) - Frigid and far-flung Neptune, our solar system's outermost planet, is adding to its reputation as an enigmatic world, with astronomers puzzled by a surprising drop in its ...

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Artist’s rendering of TOI-1231 b, a Neptune-like planet about 90 light years away from Earth. NASA/JPL-Caltech Discovering planets beyond our solar system is one thing — we’ve discovered over 4,000 ...

WASHINGTON — Frigid and far-flung Neptune, our solar system’s outermost planet, is adding to its reputation as an enigmatic world, with astronomers puzzled by a surprising drop in its atmospheric ...