alt Hacker News>> More information: Shimpei Nishimoto et al, Infrared Bubble Recognition in the Milky Way and Beyond Using Deep Learning, Publications of the Astronomical Society of Japan (2025). DOI: 10.1093/pasj/psaf008
It links to a doi.org URL which directs the browser to what you linked.
And has the value of "it doesn't go dead as easily" - https://en.wikipedia.org/wiki/Digital_object_identifier
> The DOI for a document remains fixed over the lifetime of the document, whereas its location and other metadata may change. Referring to an online document by its DOI should provide a more stable link than directly using its URL. But if its URL changes, the publisher must update the metadata for the DOI to maintain the link to the URL. It is the publisher's responsibility to update the DOI database. If they fail to do so, the DOI resolves to a dead link, leaving the DOI useless.
More about it at Digital Object Identifier (DOI) Under the Context of Research Data Librarianship - https://doi.org/10.7191%2Fjeslib.2021.1180