[astro123]

No-one is making an argument by authority. Here is a nice popular article that outlines some of the issues with MOND https://www.forbes.com/sites/startswithabang/2018/03/06/only...

I just think that it is very hard to understand the scientific consensus (average view of people who spend a lot of time thinking about this) when all you read are popular science articles that tend to focus on the exciting/new/possibly game changing edges. I'm just here letting people know what the consensus is.

[rpedela]

Most people on HN are aware that the consensus, a form of argument by authority, is dark matter. It is also known that the dark matter consensus has problems despite billions spent on research over decades. When there is an experimental result that contradicts the leading theory, that is interesting and worthy of media attention. If this experimental result was only published in popular media, then I too would likely ignore it. However it was also published in a major journal. Like you said elsewhere, that doesn't mean it is right. But I think it is worthy of attention and discussion and should not be dismissed out of hand because it doesn't agree with consensus.

[dodobirdlord]

The existence of a consensus opinion isn’t an argument from authority. To claim so is an interesting form of the post hoc ergo propter hoc fallacy ('after this, therefore because of this'). The argument for agreeing with the consensus isn’t the existence of the consensus, but rather the same argument that caused the consensus to exist, the underlying body of research.

Framing it as a result that flies in the face of consensus is fun and exciting, especially since people who are science-literate know that a single compelling result can overturn a consensus formed by a large body of previous work. But framing it in that sense is unhelpful, since the vast majority of publications that “fly in the face of consensus” do not. It’s a lot less exciting to view this as one more paper on a large pile supporting MOND, that is still small in comparison to the pile that support dark matter. The paper is obviously worthy of attention and isn’t being dismissed out of hand, it is published in The Astrophysical Journal. But would Hacker News be discussing it if not for the contrarianism embodied by the former framing, as opposed to the latter?

[rpedela]

"Here is why the consensus is _______" is not argument by authority, correct.

"The ________ theory/hypothesis is fringe, the consensus is ________" is argument by authority.

See the difference? Phrasing matters in this case. All too often it is phrased the second way. I don't expect someone to literally enumerate all the evidence for or against something, but there is a middle ground between that and just saying "well consensus is ______".

[scott_s]

> "The ________ theory/hypothesis is fringe, the consensus is ________" is argument by authority.

That is not an argument, so it can't be "argument by authority." It is a framing.

[wnoise]

It's not an explicit argument. Most arguments people make have lots of implicit steps and subarguments though. This is one of those cases.

[rat9988]

It is clearly a case of argument by authority.

[StanislavPetrov]

>The existence of a consensus opinion isn’t an argument from authority.

That's exactly what it is. The rest of your argument boils down to, "if a lot of prominent people in a field believe something, it must be because there is a lot of merit-based evidence". That assertion is completely false. Merit-based evidence is one of the ingredients that lead to consensus, but hardly the only one.

[betwixthewires]

I see your point, but I think the person you're responding to is trying to say that he is not saying "if a lot of prominent people believe something then it must be because there's a lot of evidence" but rather "there is a lot of evidence, that is why so many people believe it." The difference there is in actually being able to show you the evidence rather than just telling you to trust a priesthood. I don't think that the person you're responding to is using the consensus in place of the evidence, but rather telling you that if you look into it deeply you'll realize why the consensus exists.

[amanaplanacanal]

The consensus is not always correct, but unless one becomes an expert in the field, betting on the consensus being right is probably the way to go.

[Chris2048]

> consensus, a form of argument by authority

It's not, because is specifically argument based on authority. Consensus could have authority in democratic context, but that isn't the meaning of "argument by <X>" which is the distilled context of some basis of proof. You could just as easily link consensus to "Argumentum ad populum".

In fact, this is spelled out on wikipedia: The two are similar, but not the same - both are "Fallacies of relevance": https://en.wikipedia.org/wiki/Argumentum_ad_populum

This doesn't really apply either though, because we are talking consensus among a specialized group of experts/peers, which seems to me a lot more relevant that general consensus. Appeal to authority isn't always fallicious: https://en.wikipedia.org/wiki/Argument_from_authority