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dark matter is not a theory

Physicist Angela Collier argues that dark matter is not a theory but a set of observations, covering rotation curves, the CMB and why modified gravity struggles to explain them.

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Why HN readers recommended it

HN links it to correct the common misconception about dark matter and as a counterpoint to popular science coverage, though one commenter found it muddled.

This is a summary from the source dataset, not an endorsement by Hacker News or the video creator.

Video & recommendation details

Creator / channel
Angela Collier
Topic
dark matter
Format
explainer
Level
intermediate
HN recommenders in dataset
5
HN mentions in dataset
11
Recommendation years in dataset
2023–2024

These counts and years describe the included Hacker News records; they are not YouTube views or the video’s publication date.

From the original HN conversations

Excerpts from the recorded comments. Follow each source for the full comment and surrounding discussion.

  • This is a dense video, I highly recommend it though: [VIDEO] TLDW: there's a lot of evidence on why the phenomena we watch is mostly favored to be described as 'something' that is conveniently called dark matter as opposed to a revision of gravity.

    badosu on Hacker News · 2023-12
    In Astronomers posit that we live in a giant void

  • There's a good cosmology YouTuber who basically explains: dark matter is not a theory, it's a set of observations. Galaxies behave like there's a halo of invisible mass surrounding them, one that varies in density per-galaxy. The halos even perturb as expected in galaxy collisions. …

    Pxtl on Hacker News · 2023-10
    In Revisited mass of the Milky Way is much smaller than expectations from cosmology

  • If you're interested in learning more I recommend you watch "dark matter is not a theory"[1]. We consistently, across many measures, observe the effect of substantially more mass than we expect using traditional understandings of dynamics. People have been aware of it, under different names, …

    aeturnum on Hacker News · 2023-10
    In Revisited mass of the Milky Way is much smaller than expectations from cosmology

Summaries, classifications and recommendation records are from the HackerTube source dataset. Read about this library and its limitations.

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