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2023年12月24日 · The Sun is currently a yellow dwarf. Like all stars, it began as a contracting nebula - effectively a cloud of dust and gas. As each particle has its own tiny gravitational pull, the dust and gas began to coalesce into a protostar. As this mass is pulled together and collapses in on itself it generates heat.
2022年3月16日 · The sun is a yellow dwarf star in the center of the solar system, and it is the largest, brightest and most massive object in the system. The sun formed around 4.5 billion years ago. At that time ...
The Sun. The Sun is our nearest star. Nuclear reactions deep within create energy in the form of the light and heat that we need to survive. To generate this energy, the Sun consumes four million tonnes of hydrogen fuel every second, and has done so since it was born, around 4.6 billion years ago. But the Sun is so large that it is expected to ...
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2021年6月9日 · History of observing the sun. The sun lies at the heart of the solar system, where it is by far the largest object. It holds 99.8% of the solar system's mass and is roughly 109 times the diameter ...
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- Charles Q. Choi
2017年5月8日 · 2 Answers. The capitalization or otherwise of 'sun' is a useful (but optional) device for distinguishing between our sun (i.e. the one at the centre of our own solar system) and suns somewhere else. 'The Sun' thus refers specifically to our sun, whereas 'sun' can mean both a sun (e.g.
2023年5月17日 · This site has facts, figures, images and links about the sun. The National Aeronautics and Space Administration NASA explores the unknown in air and space, innovates for the benefit of humanity, and inspires the world through discovery.
