Keysh

19 ms·

151.
by Keysh 7y ago
Peter Brown and Walter Scheidel are indeed real historians (Brown of "Late Antiquity" and Scheidel of the Roman Empire). Not everything they're quoted as saying is necessarily that solid, though. For example, if Scheidel is r
152.
by Keysh 7y ago
advances made during the early middle ages, because it needs to ignore those advances in order to make its claim. The simple fact that there were many advances in the fields of engineering, metallurgy, architecture, transportation, mathema
153.
by Keysh 7y ago
the church rejected it because it did not fit observations (the ultimate scientific reason). No, the Church rejected heliocentrism because it clashed with scripture, and because Giordano Bruno had promoted it, so they associated it with h
154.
by Keysh 7y ago
I would be skeptical about attributing too much to a newspaper report about an unpublished conference presentation, particularly as the reported increase is only 2 years (with no quoted uncertainties). From this review article about post-Ro
155.
by Keysh 7y ago
> the article hints at that Unintentionally, perhaps. Really, this is an indication of the article's incoherence and sloppiness. It purports to be mostly about the aftermath of the collapse of the Western Empire in the 5th Century,
156.
by Keysh 7y ago
James Fallows is not a "professional historian", he's a journalist. Go ahead and argue with him; this is a very confused and silly article.
157.
by Keysh 7y ago
But, as critics have pointed out correctly, the LIGO alert for this event came 40 minutes after NASA’s gamma-ray alert. For this reason, the event cannot be used as an independent confirmation of LIGO’s detection capacity. Leaving aside t
158.
by Keysh 7y ago
As an indicator of the slapdash quality: she calls into question the neutron-star merger by saying, "Furthermore, the interpretation of this signal as a neutron-star merger has also been criticized." But if you follow the link in
159.
by Keysh 7y ago
MOND famously (notoriously?) cannot explain the observed motions of galaxies within groups and clusters (the oldest known evidence for dark matter). Even if you assume MOND is true, the galaxies are moving too fast, so you need an extra sou
160.
by Keysh 7y ago
I apologize for the snark, but, really, you are both on the internet... http://letmegooglethat.com/?q=data+for+galaxy+rotation+curve... (The fourth link, for example -- http://astroweb.cwru.edu/SPARC/
161.
by Keysh 7y ago
It generally works a bit better if you say something like, "Hmm... it seems like this approach would be wrong, for this reason that just occurred to me. Am I missing something? Or: How do people in the field actually do it, so as to av
162.
by Keysh 7y ago
"My other issue is that in discussions of rotation curves, I keep seeing reference to Kepler, which simply shouldn't apply. Where can I see the math behind the "expected" curve" "Keplerian" in this context
163.
by Keysh 7y ago
For modeling individual galaxies, that's more or less correct. (Of course, the same applied to things like MOND: "hey, if Newtonian acceleration is tweaked with this interpolation function and that free parameter, it will explain
164.
by Keysh 7y ago
No, Baghdad was located in the heart of the former Persian (Sassanian) Empire, a mere 35 km from the site of the Sassanian capital (Ctesiphon). Although the whole area gradually became Arabized, at the time it was still significantly Persia
165.
by Keysh 7y ago
As someone else pointed out, this does nothing to explain why Roman-era mathematics seems to have stagnated, compared to the Classical and Hellenistic Greek mathematics that preceded it. Greek mathematicians didn't have access to India
166.
by Keysh 7y ago
The Emperors were stripped of power back in the 12th Century, after the Genpei War and the formation of the Kamakura Shogunate. They remained stripped of power for almost the next seven hundred years; the power struggles were about who woul
167.
by Keysh 7y ago
There's an excellent book on the subject called The Fall of Rome and the End of Civilization , by Bryan Ward-Perkins. It includes a detailed overview of the archeological evidence, which shows a very clear and dramatic decline in the
168.
by Keysh 7y ago
From the article: "First it gave a shorthand description of a zone — the cathedral complex was divided into four — that read “Attic Nave Sacristy.”" So the entire zone is called "Attic Nave Sacristy", and from that all y
169.
by Keysh 7y ago
It really meant something more like "the part of the cathedral complex containing the cathedral's nave, the cathedral's attic, and the sacristy building". The real problem was that both the main cathedral and the sacri
170.
by Keysh 8y ago
You don't want a supernova going off too close. We have been lucky to avoid that. Our odds were greatly improved by the fact that we spend most of our time out of the galactic plane, away from other stars that could be about to go boo
171.
by Keysh 8y ago
The first image [-7] is basically the same as the classic WFPC2 image jzl was referring to -- i.e., using the same mapping of emission-line filters to R, G, and B -- just using a newer camera.
172.
by Keysh 8y ago
You absolutely are seeing individual stars in the Triangulum Galaxy (M33) in the zoomable image. The brighter "blobs" are a combination of foreground stars (i.e., stars in our own galaxy) and star clusters in M33, but the fainter
173.
by Keysh 8y ago
China was extremely expansionist. It's just that over time they successfully assimilated (or suppressed) most of the regions they conquered, to the point where they and most other people think of them as naturally part of China (ignore
174.
by Keysh 8y ago
In fact, there’s an comment to the effect that the actual start time is about a million and a half seconds after the moon landing — which means the original time system is Unix-based...
175.
by Keysh 9y ago
To be honest, I think "planets in other galaxies" would be better (since "extragalactic galaxies" sounds a bit like "galaxies outside of galaxies").
176.
by Keysh 9y ago
There's a more comprehensive version of this story at linguist Dan Jurafsky's web site (it can also be found in the book by Jurafsky mentioned by aniket_ray): http://languageoffood.blogspot.com/2014/08/te
177.
by Keysh 9y ago
That’s only true in some areas (e.g. some biological fields). In other areas (e.g astronomy or much of physics), it’s decreasing order of contribution. In mathematics, the author list is usually alphabetical.
178.
by Keysh 9y ago
Your examples weren't so much contrived as incoherent, to the point where I begin to suspect you don't really understand NHST. "if I try to decide that native Hawaiians are US citizens, and the null hypothesis is that they ar
179.
by Keysh 9y ago
Their conclusion in the OP was AIUI that _many_ stars produce novae serially. So we should surely be able to match series of novae (along a stars trajectory). The time between classical nova outbursts is estimated to be on the order of 10
180.
by Keysh 9y ago
Binary systems that produce classical novae (like this one) don't "die". Moreover, the star that they identified is a confirmed binary system with an evolved late-type star and a white dwarf, which is precisely the kind of sy

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