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  2. Space sunshade - Wikipedia

    en.wikipedia.org/wiki/Space_sunshade

    The full raft of inflatable bubbles would be roughly the size of Brazil and include a control system to regulate its distance from the Sun and optimise its effects. [19] The shell of the thin-film bubbles would be made of silicon , tested in outer space-like conditions at a pressure of .0028 atm and at -50 degrees Celsius. [ 19 ]

  3. Orders of magnitude (illuminance) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude...

    Factor ()Multiple Value Item 0 0 lux 0 lux Absolute darkness 10 −4: 100 microlux 100 microlux: Starlight overcast moonless night sky [1]: 140 microlux: Venus at brightest [1]: 200 microlux

  4. Shade (shadow) - Wikipedia

    en.wikipedia.org/wiki/Shade_(shadow)

    Full sun – more than five hours of direct sun per day. Part shade – two to five hours of direct sun, or all-day dappled sun (sunlight shining through open trees). Full shade – less than two hours of direct sun per day. Under a dense forest canopy, light intensity can be very low. Special adaptations produce the shade tolerance that allows ...

  5. Sunshade - Wikipedia

    en.wikipedia.org/wiki/Sunshade

    Shade (shadow), the blocking of sunlight by any object; Space sunshade, a device for blocking a star's rays in space; Umbrella, a device for blocking sunlight or rain; Windshield sun shades, used to block sunlight in a car

  6. Shade tolerance - Wikipedia

    en.wikipedia.org/wiki/Shade_tolerance

    In simple terms, shade-tolerant plants grow broader, thinner leaves to catch more sunlight relative to the cost of producing the leaf. Shade-tolerant plants are also usually adapted to make more use of soil nutrients than shade-intolerant plants. [2] A distinction may be made between "shade-tolerant" plants and "shade-loving" or sciophilous ...

  7. Solar luminosity - Wikipedia

    en.wikipedia.org/wiki/Solar_luminosity

    Evolution of the solar luminosity, radius and effective temperature compared to the present-day Sun. After Ribas (2010) [1] The solar luminosity (L ☉) is a unit of radiant flux (power emitted in the form of photons) conventionally used by astronomers to measure the luminosity of stars, galaxies and other celestial objects in terms of the output of the Sun.