太阳黑子
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星空有约|太阳脸上长了雀斑:个头不小、数量可观
Xin Hua She· 2025-12-04 06:44
Core Viewpoint - The recent appearance of sunspots on the sun's surface indicates a peak in solar activity, which is part of the 25th solar cycle, and presents an opportunity for public observation [1][5]. Group 1: Sunspots Overview - Sunspots are dark spots on the sun's photosphere that vary in size, number, position, and shape daily [1]. - They typically appear in groups or clusters, with each active region containing multiple sunspots that form a complex magnetic field system [3]. - The current sunspot group was first observed on November 30 and is expected to be visible for several days due to the sun's rotation [3][5]. Group 2: Solar Activity and Implications - The current period marks the peak of the 25th solar activity cycle, characterized by a significant increase in the number and intensity of sunspots [5]. - The presence of sunspots indicates abnormal solar magnetic activity, which may lead to phenomena such as auroras [5]. - Despite the increased solar activity, the impact on human life and production is minimal, and there is no need for public concern [5]. Group 3: Observation Guidelines - The sunspot group provides a unique opportunity for the public to observe sunspots, particularly during mornings and evenings when atmospheric conditions are favorable [7]. - For safe observation, it is recommended to use telescopes equipped with solar filters, as direct viewing can cause serious eye damage [7].
超583颗卫星坠落,马斯克祸不单行
Sou Hu Cai Jing· 2025-06-10 12:00
Core Insights - The article discusses the challenges faced by Elon Musk's SpaceX, particularly with its Starlink satellite system, which has experienced a significant increase in satellite failures due to atmospheric conditions influenced by solar activity [1][3]. Group 1: Satellite Failures - SpaceX's Starlink system has seen a dramatic rise in satellite losses, with 316 satellites burning up in the atmosphere in 2024, bringing the total losses to 583 satellites since the system's inception [3]. - The annual satellite failure rate has escalated from 2 in 2020 to approximately 88-99 in recent years, indicating a concerning trend for the sustainability of the satellite network [3][5]. Group 2: Atmospheric Impact - The increase in satellite failures is attributed to the expansion of the atmosphere caused by solar flares and sunspots, which leads to increased atmospheric drag on low Earth orbit satellites [5]. - As the atmosphere becomes denser, the likelihood of satellite re-entry and failure rises, posing a significant operational challenge for SpaceX [5]. Group 3: Financial Implications - To maintain a planned fleet of 42,000 satellites, SpaceX will need to continuously launch replacement satellites, which requires substantial financial resources [5]. - The potential for ongoing satellite losses raises concerns about the financial viability of the Starlink project, reminiscent of the failed Iridium satellite system due to low user demand [7]. Group 4: Government Support - Musk is seeking support from the U.S. government to encourage more industries to adopt the Starlink system, highlighting the importance of external backing for the project's success [7]. - The relationship between Musk and former President Trump is noted as a sensitive factor that could influence future developments for SpaceX and its satellite initiatives [7].