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news Astronomy Evidence status: Peer reviewed · Observational study

White dwarf’s double debris disc may hide two surviving planetary bodies

A white dwarf has two separate gas rings. Astronomers propose two surviving planetary bodies, up to Pluto-sized, make the gas. Neither body has been seen.

What it does not show One star; rings are modelled from line shapes and the planetary bodies have not been observed

By Murad Ali Khan 9 min read
Primary sourcesResearch and official data linked in context
Evidence calibratedObservation, interpretation and speculation separated
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Diagram placing lab-grown Asgard archaea strains HC1 and SC1 beside eukaryotes on the family tree, and comparing a simple HC1 cell with protrusions to a eukaryotic cell with nucleus and mitochondria

news Biology Evidence status: Peer reviewed · Laboratory cultures and genome analysis

Lab-grown Asgard archaea closest to eukaryotes are simple inside

Two newly cultured Heimdallarchaeia, the closest known archaeal relatives of eukaryotes, lack internal membranes. What that means for how complex cells began.

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