Protoplanetary disk

Solar System

The Origin of Earth’s Water

Scientists have discovered a new candidate source for Earth's water: building blocks of the primordial solar system known as enstatite chondrites.

Superimposed: Mars river valley networks and Devon Island channels

Solar System

Was Early Mars "Wet and Warm"? Or Wet and Cold?

A new model suggests that Martian valley networks might have been created by ancient subglacial rivers rather than water flowing on the surface.

Chaotic, Jupiter-like orbit

Solar System

Jupiter Has Trapped a Comet in a Bizarre Orbit

Jupiter has captured an icy comet from the outer solar system. The comet's bizarre orbit will bring it back for another super-close pass in 2063.

Comet 2I/Borisov

Solar System

The Origins of Interstellar Objects

The first two interstellar visitors to the solar system are finally shedding light on their places of origin.

Comet Borisov

Solar System

Is the Interstellar Comet 2I/Borisov Breaking Up?

New observations of the interstellar comet — which traveled unaltered for eons before arriving in the solar system — have revealed it's fragmenting

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