Space Junk Challenges
In the article “How to Recycle Space Junk,” authored by Moriba Jah, the issue of space debris cluttering the cosmos, particularly in low Earth orbit, is discussed as a significant hindrance to various space activities. The suggestion made is to equip major satellites with a small thruster to redirect them towards the sun at the end of their operational life. However, would this contribute to polluting the sun? Is it feasible to consider that sending a sizable chunk of metal and silicon into a massive fusion reactor like the sun could be problematic?
HAROLD SHAW PENOBSCOT, ME.
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Moriba Jah’s article rightly draws attention to the issue of orbital debris around Earth. It’s crucial to also consider debris around other celestial bodies, particularly those that might host human activities in the future. This includes debris that could orbit or land on other planets and moons.
JAMES W. SCOTT VERNON, N.J.
JAH REPLIES: Harold Shaw’s proposal is thought-provoking but comes with significant challenges. Redirecting a satellite towards the sun requires a vast amount of energy due to the high orbital velocity of Earth around the sun. The process is more energy-intensive than simply adjusting the satellite’s orbit to decay towards Earth. Moreover, precise timing is needed to avoid the satellite entering an unintended orbit or colliding with other satellites. Although the impact on the sun’s fusion process would be minimal, the potential to create concentrated debris fields or trigger unintended reactions remains a risk. The environmental cost of the required fuel is also considerable. Current research is exploring alternatives such as using robotic ‘tugboats’ to adjust satellite orbits or guide them to burn up in the atmosphere, and using nets or harpoons to capture debris.
Scott is correct in emphasizing the need to address space debris as human activity extends to the moon and Mars. Debris in these areas poses risks to spacecraft and complicates the sustainability of future settlements. Solutions might include robotic missions to clear debris or infrastructure to prevent its accumulation. Developing new international agreements will be essential to manage these challenges.
Diversity in Science
In the Q&A feature “Marie Curie’s Hidden Network,” Clara Moskowitz discusses with author Dava Sobel her book about Marie Curie and the women she collaborated with in her lab. Sobel highlights that Curie was not opposed to hiring women, indicating a neutral but open approach to including female scientists in her research.
Watching technical team videos, I often count the individuals of color, noting their underrepresentation. While women have seen improved representation in scientific fields, people of color still lag behind. Ideally, selection should be based on qualifications alone, yet studies show that resumes from people of color are less likely to be pursued, often due to subconscious biases. This suggests that like Curie, who won two Nobel Prizes, overcoming stereotypes is necessary for recognition.
As we face the future, let’s acknowledge the extraordinary efforts of Madame Curie in promoting diversity, reminding us of the ongoing need to leverage all human potential in science.
K. CYRUS ROBINSON TAMPA, FLA.
Adolescent Brain Development
The article “Growing the Adolescent Mind” by Mary Helen Immordino-Yang, discusses the adolescent brain as a period ripe for growth, using the term “transcendent thinking” to describe the capacity for abstract reflection on various situations. However, this term is traditionally associated with mystical experiences, which could lead to confusion.
Immordino-Yang suggests that emotional and reflective thinking enhances brain network communication, although it might alternatively be that evolving brain connections enable such cognitive development. She refers to neuroscientist Antonio Damasio’s work which supports the latter idea, showing how brain changes can influence social and emotional intelligence.
It’s crucial to consider adolescents’ current brain capabilities as we encourage them to engage with broader perspectives.
FREDERICK TRAVIS FAIRFIELD, IOWA
IMMORDINO-YANG REPLIES: Frederick Travis brings up a valid point. We use “transcendent thinking” to mean abstract thought that goes beyond immediate, tangible concepts. While “transcendental” often refers to mystical experiences, our usage intends to describe a broader cognitive ability. Additionally, while it’s challenging to prove causality between transcendent thinking and brain development, our studies indicate a predictive relationship where early transcendent thinking forecasts later brain maturation. We continue to explore these connections at the University of Southern California’s Center for Affective Neuroscience, Development, Learning, and Education (https://candle.usc.edu).
Contrasting Concepts of ‘Blobs’
The February issue features two distinct articles about ‘blobs’: “Anatomy of a Supernova” by Clara Moskowitz, and “A New Understanding of the Cell” by Philip Ball. Although both address ‘blobs,’ the contexts and scales discussed are vastly different.
CHRIS LANDRY HUDSON, N.H.
Corrections and Clarifications
The article “Redefining Time,” by Jay Bennett, should have correctly named the BIPM as the International Bureau of Weights and Measures in full.
In “The Missing Planets” by Dakotah Tyler, the summary should have highlighted the unusual absence of exoplanets within a specific size range.
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