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  1. en.wikipedia.org › wiki › SunSun - Wikipedia

    13 hours ago · The 20th century brought about several specialized systems for observing the Sun, especially at different narrowband wavelengths, such as those using Calcium H (396.9 nm), K (393.37 nm) and Hydrogen-alpha (656.46 nm) filtering. In the early years of the modern scientific era, the source of the Sun's energy was a significant puzzle.

    • ≈4.6 billion years (4.6×10⁹ years)
    • Solar (/ˈsoʊlər/)
    • −26.74
    • 1.9885×10³⁰ kg, 332,950 Earths

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