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  2. Alpha Centauri - Wikipedia

    en.wikipedia.org/wiki/Alpha_Centauri

    For example, an Earth-like planet at 1.25 AU from α Cen A (with a revolution period of 1.34 years) would get Sun-like illumination from its primary, and α Cen B would appear 5.7–8.6 magnitudes dimmer (−21.0 to −18.2), 190–2,700 times dimmer than α Cen A but still 150–2,100 times brighter than the full Moon.

  3. Reykjavík - Wikipedia

    en.wikipedia.org/wiki/Reykjavík

    Reykjavík [a] is the capital of, and largest city in, Iceland.It is located in southwestern Iceland, on the southern shore of Faxaflói Bay. With a latitude of 64°08′ N, the city is the world's northernmost capital of a sovereign state.

  4. Sustainable Development Goals - Wikipedia

    en.wikipedia.org/wiki/Sustainable_Development_Goals

    The Sustainable Development Goals (SDGs) are a collection of 17 global objectives established by the United Nations in 2015 as part of the 2030 Agenda for Sustainable Development. These goals aim to address a broad range of interconnected global challenges, including poverty eradication , environmental sustainability , social equity , and ...

  5. Betelgeuse - Wikipedia

    en.wikipedia.org/wiki/Betelgeuse

    In 2008, measurements using the Very Large Array (VLA) produced a radio solution of 5.07 ± 1.10 mas, equaling a distance of 197 ± 45 pc or 643 ± 146 ly. [105] As the researcher, Harper, points out: "The revised Hipparcos parallax leads to a larger distance ( 152 ± 20 pc ) than the original; however, the astrometric solution still requires a ...

  6. List of chemical elements - Wikipedia

    en.wikipedia.org/wiki/List_of_chemical_elements

    118 chemical elements have been identified and named officially by IUPAC.A chemical element, often simply called an element, is a type of atom which has a specific number of protons in its atomic nucleus (i.e., a specific atomic number, or Z).

  7. Zeus - Wikipedia

    en.wikipedia.org/wiki/Zeus

    Zeus (/ zj uː s /, Ancient Greek: Ζεύς) [a] is the sky and thunder god in ancient Greek religion and mythology, who rules as king of the gods on Mount Olympus.His name is cognate with the first syllable of his Roman equivalent Jupiter.

  8. Nitrogen - Wikipedia

    en.wikipedia.org/wiki/Nitrogen

    The more well-characterised ways are the end-on M←N≡N (η 1) and M←N≡N→M (μ, bis-η 1), in which the lone pairs on the nitrogen atoms are donated to the metal cation. The less well-characterised ways involve dinitrogen donating electron pairs from the triple bond, either as a bridging ligand to two metal cations ( μ , bis- η 2 ) or ...

  9. Bessel function - Wikipedia

    en.wikipedia.org/wiki/Bessel_function

    Plot of the spherical Bessel function of the first kind j n (z) with n = 0.5 in the complex plane from −2 − 2i to 2 + 2i with colors created with Mathematica 13.1 function ComplexPlot3D Plot of the spherical Bessel function of the second kind y n (z) with n = 0.5 in the complex plane from −2 − 2i to 2 + 2i with colors created with ...