Venus will pass to the north of the much-fainter bluish star Regulus (in Leo, the Lion) on the morning of Sept. 19; the planet and star will appear low in the east-northeast predawn sky, separated by ...

An object up to dozens of times the mass of Jupiter flying through our solar system may have disrupted planetary orbits.

If planet X exists, it is likely a gas giant similar to Neptune. NASA/Caltech/R. Hurt (IPAC), CC BY Our solar system is a particularly crowded place. Millions of objects move within it, whether they ...

However, exactly how that happens for a multi-planet star system — like our solar system — is unknown. The paper, published today in The Astrophysical Journal Letters, details observations of ...

It's an interesting thought experiment; while Borisov and 'Oumuamua were smaller objects, a more massive rogue planet joining our solar system could generate orbital chaos. It could potentially ...

The solar system is approximately 4.6 billion years old. Astronomers believe that roughly 100 million years into its existence, the planets first began to form in a rotating, flat cloud of gas ...