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In number theory, a narcissistic number [1] [2] (also known as a pluperfect digital invariant (PPDI), [3] an Armstrong number [4] (after Michael F. Armstrong) [5] or a plus perfect number) [6] in a given number base is a number that is the sum of its own digits each raised to the power of the number of digits.
Portrait of Anders Ångström [15]. In 1868, Swedish physicist Anders Jonas Ångström created a chart of the spectrum of sunlight, in which he expressed the wavelengths of electromagnetic radiation in the electromagnetic spectrum in multiples of one ten-millionth of a millimetre (or 10 −7 mm.) [16] [17] Ångström's chart and table of wavelengths in the solar spectrum became widely used in ...
Once every one million years 10 −12: 1 picohertz (pHz) 1.23 pHz Precession of the Earth's axis (about every 25,700 years) 10 −11: 10 pHz ~31.71 pHz: Once per millennium 10 −10: 100 pHz ~317.1 pHz: Once per century 10 −9: 1 nanohertz (nHz) ~1 nHz: Once per generation (about every 30 years) ~2.9 nHz: Average solar cycle (about every 11 ...
30.8568 Ym – 3.2616 billion light-years – 1 gigaparsec; 31.2204106 Ym − 3.3 billion light-years − length of The Giant Arc, a large cosmic structure discovered in 2021; 33 Ym – 3.5 billion light-years – maximum distance of the 2dF Galaxy Redshift Survey (light travel distance) 37.8 Ym – 4 billion light-years – length of the Huge-LQG
Fossils preserved within ancient rock may prove that photosynthesis started way earlier than we thought.
A list of articles about numbers (not about numerals). Topics include powers of ten, notable integers, prime and cardinal numbers, and the myriad system.
Astronomers have detected one of the most distant and energetic mysterious fast radio bursts in space, a millisecond-long blast of radio waves that traveled 8 billion years to reach Earth.
Astronomers detected a fast radio burst from a galaxy 8 billion light-years away. It's a new record, and the signal's source is still a mystery. Scientists detect 8 billion-year-old radio burst.