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Lift-off of Apollo 11 on a Saturn V rocket
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图注： The Apollo 11 Saturn V Space vehicle lifts off with Astronauts Neil A. Armstrong, Michael Collins and Edwin E. Aldrin, Jr., at 9:32 a.m. local time on July 16, 1969, from Launch Complex 39A at NASA's Kennedy Space Center, for the first Moon landing.
来源： NASA
来源链接
词汇表:
阿波罗 , 月球
分类：
太空探索
授权许可： 公共领域 公共领域 图标
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11.91 MB)
土星
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图注： NASA/ESA 哈勃太空望远镜的宽视场相机3号于 2019 年 6 月 20 日观测到土星，当时这颗行星距离地球约 13.6 亿公里，是今年距离地球最近的行星。图像显示了土星表面的彩色气体条带以及由冰和岩石物质组成的突出星环。
来源： 美国国家航空航天局、欧空局、A. Simon（戈达德太空飞行中心）和 M.H. Wong（加州大学伯克利分校）
来源链接
词汇表:
气态巨行星 , 巨行星 , 外行星 , 行星环 , 土星
分类：
太阳系
授权许可： 知识共享许可协议 署名 4.0 国际 (CC BY 4.0) 知识共享许可协议 署名 4.0 国际 (CC BY 4.0) 图标
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262.21 kB)
Rhea reappearing after occultation by Titan
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图注： On October 27, 2009, NASA’s Cassini spacecraft orbiting around Saturn captured this view of Saturn's moon Rhea as it began to emerge after being hidden by Saturn's largest moon Titan during an occultation. An occultation is a celestial event in which one object moves in front of another and temporarily blocks the first object from view.
In this image, Titan — about 5,150 km across — was closer to the spacecraft at about 1 million km, while Rhea — roughly 1,528 km in diameter — was farther away at about 2.3 million km. Titan’s high-altitude atmospheric haze is visible as a faint glow around its limb, showing the difference in surface and atmospheric properties between these two moons.
Scientists study occultations like this because watching how one moon disappears behind or reappears from another helps refine our understanding of their orbits and physical characteristics.
来源： NASA/JPL/Space Science Institute
来源链接
词汇表:
卫星 , 泰坦 , 掩星
授权许可： 公共领域 公共领域 图标
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85.73 kB)
Global Temperature Trends: Past 50 Years
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图注： This map visualizes the changes in surface air temperature across the globe over the past half-century. Through meticulous analysis of annual averages, the map highlights the most significant trends in temperature change, particularly emphasizing shifts in northern latitudes and over land masses.
来源： NASA’s Scientific Visualization Studio, Key and Title by Eric Fisk
来源链接
词汇表:
全球气候变暖
分类：
地球
授权许可： 知识共享许可协议 署名 4.0 国际 (CC BY 4.0) 知识共享许可协议 署名 4.0 国际 (CC BY 4.0) 图标
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108.48 kB)
Copernicus's heliocentric system
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图注： Sketch of Copernicus's heliocentric model of the Solar System, from his book "De revolutionibus orbium coelestium" (On the revolution of the heavenly spheres) published in 1543. Shown are the Sun as well as the orbits of Mercury, Venus, the Earth (itself orbited by the Moon), Mars, Jupiter and Saturn. The outermost circle represents the sphere of the stars.
In this model, the Earth is not special – it is merely one planet, among several, orbiting the Sun. This was the first example for what is now known as the Copernican Principle: that our positions as observers in the universe is not special or privileged in any way. The shift from the geocentric to the heliocentric model of our universe is known as the Copernican revolution.
来源： Nicolaus Copernicus
来源链接
词汇表:
哥白尼革命 , 日心模型 , 科学模型 , 哥白尼原理
分类：
太阳系
授权许可： 公共领域 公共领域 图标
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702.64 kB)
