Magellanic Stream
neutral hydrogen (HI) flux formed by the gravitational interaction of the Milky Way and the Magellanic Clouds
The Magellanic Stream is a stream of high-velocity clouds of gas extending behind the Large and Small Magellanic Clouds over 100° through the Galactic south pole of the Milky Way. Associated with the stream is the leading arm feature. The stream was sighted in 1965 and its relation to the Magellanic Clouds was established in 1974.
Discovery and early observations
In 1965, anomalous velocity gas clouds were found in the region of the Magellanic Clouds. The gas stretches for at least 180 degrees across the sky. This corresponds to 180 kpc (600,000 ly) at an approximate distance of 55 kpc (180,000 ly). The gas is very collimated and polar with respect to the Milky Way. The velocity range is huge (from −400 to 400 km s−1 in reference to Local Standard of Rest) and velocity patterns do not follow the rest of the Milky Way. Hence, it was determined to be a classic high-velocity cloud.
However, the gas was not mapped, and the connection to the two Magellanic Clouds was not made.
This brief starts where responsible research should: with the source description of “Magellanic Stream” as neutral hydrogen (HI) flux formed by the gravitational interaction of the Milky Way and the Magellanic Clouds. Everything that follows is an evidence route, not borrowed authority.
Why this record matters
The subject matters to the general reference register because the source frames it as neutral hydrogen (HI) flux formed by the gravitational interaction of the Milky Way and the Magellanic Clouds. Its deeper value depends on whether names, dates, institutions and citations support that framing.
Vocabulary and entity names are the principal evidence signals here, because they determine the precision of every later search. The source revision retrieved here is dated Sep 4, 2026. The linked authority identifier is Q50032. None of the 0 selected statements returned an explicit reference. The first chronological checks are 1965 and 1974.
A concise general-reference account can conceal disagreements about scope, terminology or the weight assigned to individual sources. The source lead contains qualifying language; that uncertainty should survive quotation, summary and reuse. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
Use the entry as an orientation point, then follow its citations and revision history. Names, dates and institutional relationships should be checked against the original record.
- Subject orientation
- Search vocabulary
- Locating named sources
The closest primary source, responsible institution and strongest cited specialist reference.
Three-step research path
- Establish the record: confirm the title “Magellanic Stream”, its source revision and the description used here.
- Expand the search: follow Magellanic Stream primary sources, Magellanic Stream archive and Magellanic research across catalogues and specialist indexes.
- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
- Which source most directly establishes the central claim about “Magellanic Stream”?
- What terminology or title could unlock a more precise catalogue search?
- Which cited source is closest to the event, object or claim?
Search terms from this dossier
This entry incorporates text from “Magellanic Stream” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.