The Sun is the star at the center of the Solar System. It is a massive, nearly perfect sphere of hot plasma, heated to incandescence by nuclear fusion reactions in its core, radiating the energy from its surface mainly as visible light and infrared radiation with 10% at ultraviolet energies. It is by far the most important source of energy for life on Earth. The … See more
The Sun consists mainly of the elements hydrogen and helium. At this time in the Sun's life, they account for 74.9% and 23.8%, respectively, of the mass of the Sun in the photosphere. All heavier elements, called … See more
Structure and fusion
The core of the Sun extends from the center to about 20–25% of the solar radius. It has a density of up to 150 g/cm (about 150 times the density of water) and a temperature of close to 15.7 million kelvin (K). By con… See more
22 hours ago — Social media app icons on a smartphone screen. Social media are interactive technologies that facilitate the creation, sharing and aggregation of content (such as ideas, …
22 hours ago — Toggle the table of contents. ... Pareidolia, a tendency to perceive a vague and random stimulus (often an image or sound) as significant, e.g., seeing images of animals or …
22 hours ago — The modern study of genetics at the level of DNA is known as molecular genetics. ... Though many genes have simple structures, as with much of biology, others can be quite …
22 hours ago — Archaea (/ ɑːr ˈ k iː ə / ⓘ ar-KEE-ə) is a domain of organisms.Traditionally, Archaea only included its prokaryotic members, but this sense has been found to be …
22 hours ago — Latin (lingua Latina, pronounced [ˈlɪŋɡʷa ɫaˈtiːna], or Latinum [ɫaˈtiːnʊ̃]) is a classical language belonging to the Italic branch of the Indo-European languages.Classical …
22 hours ago — A carbon nanotube (CNT) is a tube made of carbon with a diameter in the nanometre range ().They are one of the allotropes of carbon.Two broad classes of carbon …