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“韦布”实现小型气态巨行星直接成像
Ke Ji Ri Bao· 2025-06-25 23:29
Core Insights - The James Webb Space Telescope (JWST) has successfully captured direct images of a small gas giant exoplanet, marking a significant step towards observing smaller planets closer to Earth's mass [1][2] - This discovery fills a gap in understanding the formation processes of early planets and the dynamics within protoplanetary disks [1] Group 1: Exoplanet Discovery - JWST has identified the smallest exoplanet observed through direct imaging to date, overcoming significant technical challenges due to the planet's faintness and proximity to its bright host star [1] - The exoplanet, named TWA 7b, is estimated to have a mass approximately 0.3 times that of Jupiter and orbits its host star at a distance of 52 astronomical units [2] Group 2: Technological Advancements - A specialized coronagraph developed by the Paris Observatory was installed on JWST's MIRI instrument to block the central star's light, facilitating the observation of fainter objects [1] - Future JWST missions aim to capture images of exoplanets with masses as low as 10% of Jupiter, enhancing the understanding of terrestrial planets [2] Group 3: Implications for Astronomy - The discovery of TWA 7b represents a major breakthrough in the study of lower-mass exoplanets and sets the stage for future explorations [2] - Advancements in imaging technology, both in space and on the ground, are expected to improve the capability to search for exoplanets, further unraveling cosmic mysteries [2]
中国科学家领衔发现一颗“超级地球”!或存在碳基生命
Guan Cha Zhe Wang· 2025-06-03 11:29
Core Insights - The discovery of a super-Earth, Kepler-725c, in the habitable zone of a sun-like star, Kepler-725, represents a significant breakthrough in the search for extraterrestrial life [1][3] - The research was led by the Yunnan Observatory of the Chinese Academy of Sciences and utilized Transit Timing Variation (TTV) technology [1][4] - The findings were published in the prestigious journal Nature Astronomy, highlighting the potential for discovering Earth-like planets [1] Group 1 - The super-Earth Kepler-725c has a mass approximately 10 times that of Earth and is located in the habitable zone, which is crucial for the existence of liquid water [1][3] - Kepler-725, the host star, is a G9V type, younger than the Sun at 1.6 billion years old, and exhibits more intense magnetic activity [3][4] - The orbital period of Kepler-725c is about 207.5 days, which is similar to Earth's orbital period, suggesting potential similarities in environmental conditions [3] Group 2 - The discovery opens new avenues for finding "Earth 2.0" in the habitable zones of sun-like stars, which is essential for understanding the origins of life [1][4] - The distance from Earth to Kepler-725c is approximately 160 million kilometers, which is a significant distance in astronomical terms [4]
超期服役的哈勃望远镜再续传奇
Ke Ji Ri Bao· 2025-05-19 22:30
Core Viewpoint - NASA celebrates the 35th anniversary of the Hubble Space Telescope, highlighting its significant contributions to space science and its ongoing relevance despite plans for a successor [4][6]. Group 1: Hubble's Achievements - Hubble has transformed human understanding of the universe, providing vivid images and numerous scientific breakthroughs since its launch in 1990 [4]. - The telescope has conducted nearly 1.7 million observations of approximately 55,000 astronomical targets, leading to over 22,000 published papers with more than 1.3 million citations [8]. - Hubble's unique ability to capture ultraviolet light allows it to observe celestial phenomena that ground-based telescopes cannot, achieving ten times the clarity of traditional ground-based observations [7]. Group 2: Current Status and Popularity - Despite being operational for 35 years, Hubble remains one of the most sought-after astronomical instruments, with the number of scientists applying for observation time being six times greater than the available slots [8]. - Hubble's data archive exceeds 400 terabytes, showcasing its extensive contributions to astronomical research [8]. Group 3: Future Considerations - Hubble is currently beyond its intended operational lifespan, with the last maintenance mission conducted 16 years ago, raising concerns about its future viability [9]. - NASA faces budget constraints, with funding expected to decrease significantly, complicating any potential maintenance or operational extension for Hubble [10].