Gauging the mass of a black hole is tricky, but astronomers have devised multiple methods to measure the heft of these galactic gluttons

طور علماء الفلك طرقًا متعددة لقياس كتلة الثقوب السوداء، وهي مهمة صعبة بسبب طبيعتها الغامضة. فهم كتلة هذه العمالقة الكونية أمر بالغ الأهمية لفهم دورها في الكون وكيف تؤثر على تشكيل وتطور المجرات.

Los astrónomos han desarrollado varios métodos para medir la masa de los agujeros negros, una tarea complicada debido a su naturaleza esquiva. Comprender la masa de estos gigantes cósmicos es crucial para entender su papel en el universo y cómo influyen en la formación y evolución de las galaxias.

Les astronomes ont développé plusieurs méthodes pour mesurer la masse des trous noirs, une tâche difficile en raison de leur nature insaisissable. Comprendre la masse de ces géants cosmiques est crucial pour saisir leur rôle dans l'univers et comment ils influencent la formation et l'évolution des galaxies.

Astronomers have developed various methods to measure the mass of black holes, which is a challenging task due to their elusive nature. Understanding the mass of these cosmic giants is crucial for comprehending their role in the universe and how they influence the formation and evolution of galaxies.

How to Weigh a Black Hole

A new study looks at how the mouth-on-mouth smooch came into being, and concludes that Neanderthals also kissed.

أظهرت دراسة حديثة أن فعل التقبيل يعود إلى 21 مليون سنة، مما يشير إلى أن إنسان النياندرتال أيضًا كان يمارس هذا السلوك الحميم. تستكشف الدراسة أصول الاتصال بين الفم والفم، مقدمةً رؤى حول الروابط الاجتماعية والعاطفية لأسلاف البشر. تضيف هذه الاكتشافات بعدًا جديدًا لفهم تطور الإنسان والتفاعلات الاجتماعية.

Un estudio reciente ha revelado que el acto de besar se remonta a 21 millones de años, sugiriendo que incluso los neandertales participaban en este comportamiento íntimo. La investigación explora los orígenes del contacto boca a boca, proporcionando información sobre las conexiones sociales y emocionales de los ancestros humanos. Este hallazgo añade una nueva dimensión a la comprensión de la evolución humana y las interacciones sociales.

Une étude récente a révélé que l'acte d'embrasser remonte à 21 millions d'années, suggérant que même les Néandertaliens participaient à ce comportement intime. La recherche explore les origines du contact bouche à bouche, offrant des perspectives sur les liens sociaux et émotionnels des ancêtres humains. Cette découverte ajoute une nouvelle dimension à la compréhension de l'évolution humaine et des interactions sociales.

A recent study has revealed that the act of kissing dates back 21 million years, suggesting that even Neanderthals engaged in this intimate behavior. The research explores the origins of mouth-on-mouth contact, providing insights into the social and emotional connections of early human ancestors. This finding adds a new dimension to the understanding of human evolution and social interactions.

First kiss dates back 21 million years, say scientists

Study from University of Oxford looks into evolutionary origins of kissing and its role in relations between speciesFrom Galápagos albatrosses to polar bears, chimpanzees to orangutans, certain species appear to kiss. Now researchers suggest Neanderthals did it too – and might even have locked lips with modern humans.It is not the first time scientists have suggested Neanderthals and early modern humans were intimately acquainted. Among previous studies, researchers have found humans and their thick-browed cousins <a href="https://www.nature.com/articles/nature21674">shared the same mouth microbe</a> for hundreds of thousands of years after the two species split, suggesting they swapped saliva. <a href="https://www.theguardian.com/science/2025/nov/19/neanderthals-early-humans-kissed-research-evolution">Continue reading...</a>

Neanderthals and early humans ‘likely to have kissed’, say scientists

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Albert Einstein's theory of gravity, general relativity, may not be  the best recipe to describe black holes.

قد لا تكون نظرية الجاذبية لألبرت أينشتاين، المعروفة بالنسبية العامة، هي الوصفة الأفضل لوصف الثقوب السوداء، حيث توفر تقنيات التصوير الجديدة ملاحظات أكثر تفصيلاً. يثير هذا تساؤلات حول دقة توقعات أينشتاين بشأن هذه الظواهر الكونية، مما يشير إلى أن فهمنا للثقوب السوداء قد يحتاج إلى مراجعة.

La teoría de la gravedad de Albert Einstein, conocida como relatividad general, puede no ser la mejor forma de describir los agujeros negros, ya que nuevas técnicas de imagen proporcionan observaciones más detalladas. Esto plantea dudas sobre la precisión de las predicciones de Einstein respecto a estos fenómenos cósmicos, sugiriendo que nuestra comprensión de los agujeros negros podría necesitar ser revisada.

La théorie de la gravité d'Albert Einstein, connue sous le nom de relativité générale, pourrait ne pas expliquer pleinement la nature des trous noirs, alors que de nouvelles techniques d'imagerie fournissent des observations plus détaillées. Cela soulève des questions sur l'exactitude des prédictions d'Einstein concernant ces phénomènes cosmiques, suggérant que notre compréhension des trous noirs pourrait nécessiter une révision.

Albert Einstein's theory of gravity, known as general relativity, may not fully explain the nature of black holes as new imaging techniques provide more detailed observations. This raises questions about the accuracy of Einstein's predictions regarding these cosmic phenomena, suggesting that our understanding of black holes may need to be revised.

As our black hole images get more detailed, we may find Einstein wasn't quite right about them

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Solve a holey shape conundrum in this math puzzle

How to Weigh a Black Hole

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