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Balloon Flask Workshop: modelling the celestial sphere
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图注： Participants look on a demonstration of how to model the celestial sphere
来源： Organisers of the 4th Chilean Astronomy Education Conference
A Geocentric chart from 1568
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图注： This map, created in 1568 by the Portuguese cartographer Bartolomeu Velho, depicts the worldview of the time, when many scholars believed in a geocentric model of the cosmos — the idea that Earth sits at the centre of the Universe with the Sun, Moon, the five planets known at the time, and stars moving around it. Although primarily a navigational chart, the design and layout of this map were influenced by astronomical understanding rooted in geocentric thinking.
The geocentric model was widely accepted for many centuries, especially in Europe, based on interpretations of celestial motions and philosophical traditions that placed Earth at the centre. It was only later, with observations by astronomers such as, Galileo Galilei, that this model was replaced by the heliocentric model, which places the Sun at the centre of the Solar System.
来源： Bartolomeu Velho
来源链接
词汇表:
地心说 , 科学模型
授权许可： 公共领域 公共领域 图标
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12.99 MB)
Tiruchirappalli Workshop participants and materials December 2024
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图注： Workshop participants showing the paper models they prepared.
来源： OAE Center India
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)
Herschel’s view of new stars and molecular clouds
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图注： This image shows the Westerhout 3, 4 and 5 star formation regions. This area has huge amounts of gas and dust. This gas and dust hides the physical processes going on in this region from studies using visible light. This image was taken in infrared light by the Herschel Space Observatory. This infrared light allowed Herschel to see deep into these star forming regions.
In Westerhout 3, 4 and 5, huge, cold clouds of molecular hydrogen have collapsed into dense knots and filaments. Within these new structures the gas is dense and cold enough for it to collapse and form stars. These new stars give off powerful winds of charged particles, like stronger versions of the solar wind our sun gives off. These winds have combined to blow massive bubbles in the surrounding gas and dust. These are visible as the large darker voids in the image.
来源： ESA/Herschel/NASA/JPL-Caltech; acknowledgement: R. Hurt (JPL-Caltech)
来源链接
词汇表:
红外天文学 , 恒星形成 , 星际介质 , 分子云 , 星风
分类：
银河系与星际介质
, 恒星
授权许可： 知识共享许可协议 Attribution 3.0 IGO 知识共享许可协议 Attribution 3.0 IGO 图标
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4.53 MB)
