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September 16, 2025<\/p>\n
4 min read<\/p>\n
Readers Respond to the May 2025 Issue<\/p>\n
Letters to the editors for the May 2025 issue of Scientific American<\/p>\n
Scientific American, May 2025<\/p>\n
\u201cDark Comets,\u201d by Robin George Andrews, describes a group of objects in our solar system with \u201cunexplained\u201d acceleration. That made me wonder: Is it possible that while dark energy appears uniform over galactic scales, it is actually more discrete at smaller scales such as that of the solar system? And if such packets of dark energy were to occur near or on one of these \u201cdark comets,\u201d could they be giving those unusual bodies the mysterious acceleration? I guess that wouldn\u2019t really answer anything until we better understand dark energy, but it would be a place to look for clues.<\/p>\n
MICHAEL K. MARTIN VIA E-MAIL<\/p>\n
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Andrews\u2019s article notes that the cause of the observed acceleration of some items passing through our solar system is unclear. The article considers whether outgassing might induce the acceleration, but no strong evidence for this option has been found. Unconsidered is another possible influence relating to magnetic fields.<\/p>\n
An object that is made up of fused metals might accumulate an electrical charge. A charged item that travels through strong magnetic fields, as could be encountered close to the sun or Jupiter, might be expected to display acceleration without any visible emissions. Has anyone done the calculations to see if this might account for some of the anomalous acceleration?<\/p>\n
SCOTT T. MEISSNER VIA E-MAIL<\/p>\n
ANDREWS REPLIES: Seeing as dark energy appears to be responsible for accelerating the expansion of the universe, it\u2019s not unreasonable to wonder whether it\u2019s giving certain comets an extra speed boost, too. But Martin is right: we don\u2019t really understand dark energy, so invoking it to explain these weird zigzagging objects is probably a dead end\u2014and I\u2019m not sure dark energy operates on such a specific and tiny scale.<\/p>\n
I like Meissner\u2019s idea that these objects might be pushed by an electromagnetic force! One issue, though, is that of composition: highly metallic asteroids, including ones like Psyche (which is potentially an exposed iron core from a destroyed planet), don\u2019t appear to be affected by the magnetic field of the sun or Jupiter in this way. So this is probably not the explanation for dark comets.<\/p>\n
I read \u201cDeep-Sea Mining Begins,\u201d by Willem Marx, with anger. It seems the problem of deep-sea mining is not only an economic or political one; it is also an ethical and moral one. Too many people think only of their own livelihood. They care about their present lives but not about Earth\u2019s future. We must boost our society\u2019s moral standards.<\/p>\n
HIROYUKI UCHIDA TOKYO<\/p>\n
\u201cTurtle Dance,\u201d by Jack Tamisiea [Advances], observes that loggerhead sea turtles dance when they find food and also form lifelong memories of Earth\u2019s magnetic field specific to such feeding grounds. If a sea turtle can navigate with our planet\u2019s magnetic field, it must have a magnetic sensor. It seems likely to me that a sea turtle\u2019s \u201cdance\u201d creates the lifelong memory by finding which body orientation maximizes the response in its magnetic sensor, similar to the calibration of a magnetic fluxgate compass.<\/p>\n
JAMES R. McGEE LAKE ELMO, MINN.<\/p>\n
\u201cShape Shift,\u201d by Rachel Crowell and Violet Frances, presents mathematicians\u2019 descriptions of beautiful and intriguing forms and surfaces. Among them, Sarah Hart of Birkbeck, University of London, discusses cycloids\u2014curves traced out by a point on a circle\u2019s circumference as it rolls along a line\u2014and describes an interesting property concerning the descent of a particle along a cycloid: under gravity, the particle \u201cwill reach the bottom in the same time no matter where on the curve it is released.\u201d<\/p>\n
I wonder whether Hart is aware that in Herman Melville\u2019s 1851 novel Moby-Dick, the character of Ishmael observes and empirically solves this very problem while scrubbing a large iron pot used to render oil from whale blubber: \u201cI was first indirectly struck by the remarkable fact, that in geometry all bodies gliding along the cycloid, my soapstone for example, will descend from any point in precisely the same time.\u201d Melville was an intuitive mathematician and an extremely acute observer of everything.<\/p>\n
\u201cCWITHAL\u201d VIA E-MAIL<\/p>\n
In \u201cRomantic Hopes\u201d [Advances; June], Clarissa Brincat reports on a review of past studies that suggests that men place more importance on romantic relationships than women do because they \u201cexpect to gain more.\u201d The article quotes psychologist Mariko Visserman as noting that the paper explains \u201chow gendered norms and experiences early in life can set the stage for the differences between men\u2019s and women\u2019s relationship benefits and vulnerabilities later on.\u201d It is not surprising that early experiences set up adult patterns. What is surprising is that the article never mentions the form of society that produces the cultural \u201cgendered norms\u201d from which those early experiences and relationship patterns arise: patriarchy.<\/p>\n
As a now retired psychotherapist with a master of social work degree, I\u2019d say it is no wonder that female expectations of romantic relationships are not very high. Most women are still often harshly judged by men who don\u2019t believe they are entitled to enjoy the same freedoms, including sex, as men do. The gendered norms of patriarchy give rise to men who seek to dominate women and use them as sex objects. Romantic relationships should be fun and exciting for women and men in our sociable species. But from adolescence, women are \u201chit on\u201d at school, in the workplace and in public with sexual innuendo, ridicule and unwanted sexual advances. This barrage of insults and pressure that approaches or, more likely, is the cultural norm naturally disheartens many women from actively seeking romance. Many women of course still seek romantic relationships, although most are understandably quite guarded and take time to trust. Feminism has been attacked for decades, if not longer.<\/p>\n
Your article\u2019s omission of a mention of what seems to be the obvious determinative role of patriarchy in relationships is concerning and suggests the same norms may be at work covertly or overtly in your publication.<\/p>\n
ELLIOTT LIBMAN VIA E-MAIL<\/p>\n
In \u201cDark Comets,\u201d by Robin George Andrews, an image of the asteroid Bennu was incorrectly identified as showing the asteroid Ryugu.<\/p>\n
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