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人类再见!旅行者号向前
Zhong Guo Qing Nian Bao· 2026-01-06 23:12
最新遥测数据显示,旅行者1号在太阳系边界撞到了一面看不见的、温度高达30000摄氏度的"火墙",又 一次为科学界理解日球层与星际介质的交界提供新线索。它还将达成一项里程碑式的成就,预计到2026 年11月,旅行者1号将距离地球一个光日。 曾经被预测会在2025年彻底失联的旅行者1号——这个人类历史上飞得最远的行星探测器,又一次跨过 了新的一年,就像它过去不断创造的奇迹一样。 目前,它正以每秒约17公里的速度,在距离地球255亿公里外沿着银河系向蛇夫座飞去。尽管它已经非 常老了,大多数科学仪器已被关闭,功率输出不足初始时的一半,与地球的通信速率甚至低于20世纪90 年代拨号上网的速度,但它仍然在用最后的力气,为人类传递信息。 这个航行了近半个世纪,推动人类对太阳系认知跃迁的"老家伙",最初任务计划仅有5年。 1965年,科学家偶然发现,20世纪70年代末,木星、土星、天王星、海王星将罕见地与地球连成一条弧 线。届时,探测器可以像打台球一样,借助行星引力助推,将抵达海王星的时间从30年缩短至12年。 这是一种罕见的天象,据测算,每隔175年才会出现一次。上一次出现还是在拿破仑战争时期,人们还 需要在马背、帆船和独 ...
张朝阳与David Tong谈物理学习:科学教育必须注入严谨的数学思维
Yang Guang Wang· 2025-08-19 01:34
Core Insights - The dialogue between Zhang Chaoyang and David Tong covers significant advancements in physics, emphasizing the importance of basic science communication in the internet age [2][3][10] Group 1: Classical Physics - The discussion begins with classical physics, highlighting Newton's contributions and the historical context of his work, including the near-miss of his recognition as the founder of classical mechanics [4] - The conversation touches on the transition in understanding fluid mechanics, particularly how the Navier-Stokes equations initially misled perceptions of flight before the significance of viscosity was recognized [5] Group 2: Electromagnetism and Quantum Mechanics - The evolution of electromagnetism is discussed, particularly the foundational role of Maxwell's equations and their stability over time [6] - The establishment of quantum mechanics is noted as a revolutionary moment in physics, with emphasis on Heisenberg's contributions and the significance of discrete energy levels [7] Group 3: Cosmology and Extraterrestrial Life - The dialogue explores the mysteries of the universe, including black holes and the implications of gravitational wave discoveries, which challenge existing theories about black hole formation [8][9] - The probability of extraterrestrial life is debated, with a focus on the vastness of the universe and the challenges of life formation [9] Group 4: Science Communication and Education - The importance of rigorous mathematical thinking in science education is emphasized, with a call for effective science communication that does not shy away from complex formulas [10] - The potential of social media for science dissemination is highlighted, suggesting that physicists could leverage personal platforms for public education and engagement [11]
科学家在类太阳恒星宜居带发现“超级地球”
Xin Hua She· 2025-06-03 14:11
Core Viewpoint - A significant discovery has been made by a Sino-German research team led by the Yunnan Observatory of the Chinese Academy of Sciences, identifying a "super-Earth" that may harbor Earth-like life around a sun-like star, marking the first use of transit timing variation (TTV) inversion technology for such a finding in the habitable zone of a sun-like star [1][2]. Group 1 - The newly discovered planet has a mass ten times that of Earth and is located approximately 2,472 light-years away from the solar system, orbiting the star Kepler-725, which is significantly younger than the Sun at only 1.6 billion years old [1]. - The research team utilized TTV inversion technology to infer the existence of this "super-Earth" by observing the slight deviations in the orbital period of another transiting planet in the Kepler-725 system [2]. - Currently, 5,912 exoplanets have been discovered, but very few are suitable for Earth-like life, as traditional methods like the transit method and radial velocity method struggle to detect smaller, distant planets like Earth [1]. Group 2 - Further investigation is required to determine if the identified habitable zone planets truly possess conditions suitable for Earth-like life [3]. - The research team expresses optimism that humanity may soon find a "blue planet" similar to Earth, potentially answering the age-old question of whether Earth is the only life-bearing planet in the vast universe [3].