What researchers found
A 9 September Chandra announcement and Nature Astronomy paper describe a population of hypersoft sources: objects detected mainly at unusually low X-ray energies. The team identified 84 candidates across six galaxies. Much of their inferred output may emerge in extreme ultraviolet light, which intervening gas readily absorbs. [1, 2]
What remains open
The researchers propose several kinds of accreting stellar systems, potentially involving white dwarfs, neutron stars or black holes. These are candidate explanations, not a single established identity for every source. [1, 2]
What to keep in mind
The observed low-energy sources are supported by the data. Their individual identities, total energy output and possible supernova connections remain uncertain.
Sources & context
Numbered references link the explanation to its sources. Hypothetical examples and visual metaphors are labelled in the text. Checked 3 October 2026.
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