Mercury is the smallest planet in our solar system. Mercury is a little more than one-third the width of Earth and has an equatorial diameter of about 3,032 miles (4,880 kilometres).

From the scorching surface of Mercury to the icy edges of Neptune, our planetary neighborhood is full of wonders. The order ...

Astronomers propose a new hypothetical planet, Planet Y, beyond Neptune, based on observed orbital anomalies in the Kuiper ...

Beyond the familiar planets lies a fascinating frontier filled with icy worlds, mysterious orbits, and cosmic curiosities.

CAPE CANAVERAL, Fla. (AP) — Astronomers have discovered the earliest seeds of rocky planets forming in the gas around a baby sun-like star, providing a precious peek into the dawn of our own ...

Updated: 12:40 PM CDT Jul 17, 2025 Editorial Standards ⓘ By Marcia Dunn, AP Aerospace Writer ... CAPE CANAVERAL, Fla. (AP) — Astronomers have discovered the earliest seeds of rocky planets forming in ...