First the solar system

Many objects have been discovered at the edge of the solar system. Figure: Avi Blizovsky using FLEX-1

Astronomers discover mysterious new objects beyond the edge of the solar system

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Observations made with the Subaru Telescope in Hawaii have revealed new objects in the outer region of the Solar System, pointing to a large, unknown population beyond the Kuiper Belt.
The preplanetary disk around the young star HL Tauri. Credit: ALMA (ESO/NAOJ/NRAO), NSF

Target board or donut? Iron meteorites reveal the early form of our solar system

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The formation of our solar system involved the accretion of gas and dust into a preplanetary disk, with meteorites providing important insights into its early composition.