Mysterious Interstellar Comet Carries Water Unlike Anything in Our Solar System ...

While life on Mars (and Venus) has long been an obsession for those wondering if we're alone, there are other places in our ...

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Key science: Stellar dynamics, N-body simulations, planetary orbital stability, and galactic gravitational potentials.

Interstellar comet 3I/ATLAS, the third object ever confirmed to have originated beyond our solar system, is heading back into ...

Moon impact 3.5 billion years ago reveals hidden Solar System history through tiny mineral grains. The discovery shows ...

The outer solar system once seemed like a quiet backwater. But a glut of tiny, strange moons with unruly orbits are coming ...

Astronomers have spent years searching for a possible hidden giant planet far beyond Neptune. Unusual orbits among distant ...

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Our solar system is a smashing success. A new study suggests that from its earliest period — even before the last of its nebular gas had been consumed — Earth’s solar system and its planets looked ...

On a clear night, it dominates the sky, bright enough to cast shadows and large enough for dark patches and surface features ...

Across the Milky Way galaxy, a planetary odd couple is circling a star some 190 light years from Earth. A normally "lonely" hot Jupiter is sharing space with a mini-Neptune, in a rare and unlikely ...