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  2. Visual perception - Wikipedia

    en.wikipedia.org/wiki/Visual_perception

    Visual perception is the ability to interpret the surrounding environment through photopic vision (daytime vision), color vision, scotopic vision (night vision), and mesopic vision (twilight vision), using light in the visible spectrum reflected by objects in the environment.

  3. Discovery and exploration of the Solar System - Wikipedia

    en.wikipedia.org/wiki/Discovery_and_exploration...

    Robert Bunsen and Gustav Kirchhoff further develop the spectroscope, which they used to pioneer the identification of the chemical elements in Earth, and also in the Sun. [32] Around 1862 Father Angelo Secchi developed the heliospectrograph, enabling him to study both the Sun and the stars, and identifying them as things intrinsically of the ...

  4. Light - Wikipedia

    en.wikipedia.org/wiki/Light

    Beam of sun light inside the cavity of Rocca ill'Abissu at Fondachelli-Fantina, Sicily. The speed of light in vacuum is defined to be exactly 299 792 458 m/s (approximately 186,282 miles per second). The fixed value of the speed of light in SI units results from the fact that the metre is now defined in terms of the speed of light.

  5. Starlight - Wikipedia

    en.wikipedia.org/wiki/Starlight

    Starlight is the light emitted by stars. [1] It typically refers to visible electromagnetic radiation from stars other than the Sun, observable from Earth at night, although a component of starlight is observable from Earth during daytime. Sunlight is the term used for the Sun's starlight

  6. Emission theory (vision) - Wikipedia

    en.wikipedia.org/wiki/Emission_theory_(vision)

    The light from the eyes of some animals (such as cats, which modern science has determined have highly reflective eyes) could also be seen in "darkness". Adherents of intromission theory countered by saying that if emission theory were true, then someone with weak eyes should have their vision improved when someone with good eyes looks at the ...

  7. Sun-observing spacecraft sheds light on the solar wind's origin

    www.aol.com/news/sun-observing-spacecraft-sheds...

    The jets emanate from structures on the corona called coronal holes where the sun's magnetic field stretches into space rather than back into the star. They are called "picoflare jets" due to ...

  8. Eddington experiment - Wikipedia

    en.wikipedia.org/wiki/Eddington_experiment

    Einstein's 1911 paper predicted deflection of star light on the limb of the Sun to be 0.83 seconds of arc and encouraged astronomers to test this prediction by observing stars near the Sun during a solar eclipse. [9] It is fortunate for Einstein that the weather precluded results by Perrine in 1912 and Perrine, Freundlich, and Campbell in 1914.

  9. Visible-light astronomy - Wikipedia

    en.wikipedia.org/wiki/Visible-light_astronomy

    The visibility of celestial objects in the night sky is affected by light pollution, with the presence of the Moon in the night sky historically hindering astronomical observation by increasing the amount of ambient lighting. With the advent of artificial light sources, however, light pollution has been a growing problem for viewing the night ...