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  2. Division (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Division_(mathematics)

    In terms of partition, 20 / 5 means the size of each of 5 parts into which a set of size 20 is divided. For example, 20 apples divide into five groups of four apples, meaning that "twenty divided by five is equal to four". This is denoted as 20 / 5 = 4, or ⁠ 20 / 5 ⁠ = 4. [2] In the example, 20 is the dividend, 5 is the divisor, and 4 is ...

  3. Sunlight - Wikipedia

    en.wikipedia.org/wiki/Sunlight

    In terms of energy, sunlight at Earth's surface is around 52 to 55 percent infrared (above 700 nm), 42 to 43 percent visible (400 to 700 nm), and 3 to 5 percent ultraviolet (below 400 nm). [7] At the top of the atmosphere, sunlight is about 30% more intense, having about 8% ultraviolet (UV), [ 8 ] with most of the extra UV consisting of ...

  4. Angular diameter - Wikipedia

    en.wikipedia.org/wiki/Angular_diameter

    5 ′ by 1° Width of little finger with arm stretched out 1° 17.5 meter at 1 km distance The Sun in the sky of Venus: 0.7° [13] [14] Io (as seen from the “surface” of Jupiter) 35’ 35” Moon: 34 ′ 6″ – 29 ′ 20″ 32.5–28 times the maximum value for Venus (orange bar below) / 2046–1760″ the Moon has a diameter of 3,474 ...

  5. Emissivity - Wikipedia

    en.wikipedia.org/wiki/Emissivity

    The ratio varies from 0 to 1. The surface of a perfect black body (with an emissivity of 1) emits thermal radiation at the rate of approximately 448 watts per square metre (W/m 2) at a room temperature of 25 °C (298 K; 77 °F). Objects have emissivities less than 1.0, and emit radiation at correspondingly lower rates. [1]

  6. List of exoplanets discovered in 2024 - Wikipedia

    en.wikipedia.org/wiki/List_of_exoplanets...

    23.6 +9.1 −7.4: 0.87 30681 +18627.8 −9496.5: 22.1 +8.0 −4.9: imaging 214.9 ± 0.3 1.52 +0.28 −0.26: 7201 +142 −112 [57] May be a brown dwarf. Estimates of the mass vary from 13.8 M J to 30 +31 −12 M J. [58] HIP 47110 b 3 to 10 3 to 30 astrometry 126.2 0.98 ± 0.05 4529 [55] [56] HIP 67522 c: 0.731 +0.055 −0.057: 14.335 0.1235 915 ...

  7. List of nearest exoplanets - Wikipedia

    en.wikipedia.org/wiki/List_of_nearest_exoplanets

    The first report of an exoplanet within this range was in 1998 for a planet orbiting around Gliese 876 (15.3 light-years (ly) away), and the latest as of 2024 is one around Struve 2398 A (11.5 ly). The closest exoplanets are those found orbiting the star closest to the Solar System, which is Proxima Centauri 4.25 light-years away.

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