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Photo: Matúš Motlo, Wikimedia Commons, CC BY-SA 4.0.Our star, the Sun, powers life on Earth and has shaped cultures for millennia. How much do you truly know about this celestial giant?
Sun Seeker 0–4 · Solar Explorer 5–8 · Heliosphere Guru 9–10
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Sunlight travels about 150 million kilometres to reach us, which takes about 8 minutes and 20 seconds. So the Sun you see in the sky is always the Sun of a few minutes ago! Yet that energy may have spent more than 10,000 years working its way out from the Sun's core before it set off.
Photo: NASA, Wikimedia Commons, Public domain.
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A solar eclipse happens when the Moon's shadow falls on Earth, temporarily blocking the Sun's light. This rare and spectacular event can be total, partial, or annular, depending on the alignment and distance of the Moon. Observing a total solar eclipse reveals the Sun's faint corona, which is usually hidden by its bright disk.
Photo: Luc Viatour, Wikimedia Commons, CC BY-SA 3.0.
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The Sun is primarily composed of hydrogen, making up about 75% of its mass. This hydrogen undergoes nuclear fusion in the Sun's core, converting into helium and releasing immense energy. While helium is the second most abundant element, hydrogen is the fuel that keeps our star shining brightly.
Photo: Matúš Motlo, Wikimedia Commons, CC BY-SA 4.0.
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Sol was the Roman god of the Sun, often shown driving a chariot pulled by horses across the sky. Helios was his Greek counterpart. The Romans called Sunday 'dies Solis', meaning 'day of the Sun'.
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From space, the Sun would appear white because it emits light across the entire visible spectrum almost evenly. Earth's atmosphere scatters blue light more efficiently, making the sky blue and causing the Sun to appear yellowish to us on the surface. This atmospheric effect is also why sunsets are often red or orange.
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Earth orbits the Sun in an elliptical path, not a perfect circle. This means its distance from the Sun varies throughout the year, being closest at perihelion (around January) and furthest at aphelion (around July). Our seasons, however, are caused by Earth's tilted axis, not by this changing distance.
Photo: Tauʻolunga, Wikimedia Commons, CC0.
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The corona is the Sun's ethereal outer atmosphere, extending millions of kilometers into space. It is incredibly hot, reaching temperatures of over a million degrees Celsius, yet it is much less dense than the layers below. Its beautiful, shimmering appearance during an eclipse has captivated observers for centuries.
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The solar wind is a flow of plasma, consisting mainly of electrons and protons, ejected from the Sun's upper atmosphere. It travels throughout the solar system, influencing planetary magnetospheres and causing phenomena like the aurora borealis and australis. This constant outflow is a fundamental aspect of how the Sun interacts with its environment.
Photo: NASA's Conceptual Image Laboratory, Wikimedia Commons, Public domain.
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Deep in the Sun's core, hydrogen fuses into helium, and a tiny bit of mass turns into a huge amount of energy. Every second the Sun fuses about 600 million tonnes of hydrogen, and its light takes about 8 minutes to reach Earth.
Photo: Xiang Gao, Yao Yang, Tao Zhang, Haiqing Liu, Guoqiang Li, Tingfeng Ming, Zixi Li, Wikimedia Commons, CC BY 3.0.
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Sunspots are temporary phenomena on the Sun's photosphere that appear darker than surrounding areas due to concentrated magnetic flux inhibiting convection, leading to reduced surface temperature. Their number varies in an approximately 11-year cycle, directly impacting space weather and Earth's technological systems.
Photo: NASA, Wikimedia Commons, Public domain.
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