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Sky

The sky is the appearance of the atmosphere around the surface of the planet from our point of view. We see many objects that are actually in space such as the Sun, the Moon, and stars because they are in the sky. On a clear day the sky appears b ...

                                               

Skylab

Skylab was the first space station of the United States. It was launched on May 14, 1973 on an extra Saturn V Moon rocket. It was launched without the third stage, lunar module, or command/service module because Skylab was itself an extra third s ...

                                               

Small solar system body

A small solar system body is a term defined in 2006 by the International Astronomical Union to describe solar system objects which are not planets or dwarf planets: All other objects orbiting the Sun shall be referred to collectively as "Small So ...

                                               

Soapstone

Soapstone or steatite is a metamorphic rock. It has a large amount of the mineral talc. Steatite is softer than most stones. Because steatite feels like soap, people call it "soapstone". People have been making things out of soapstone for thousan ...

                                               

Social psychology

Social psychology is the study in psychology of how people and groups interact. Researchers in this field are often either psychologists or sociologists. All social psychologists use both the individual and the group as their unit of analysis. De ...

                                               

Sodium monofluoroacetate

Sodium fluoroacetate is a chemical compound that is a poison for many organisms. Pesticides used kill rodents sometimes contain Sodium monofluoroacetate. Sometimes the chemical substance is used as a marker for cancer cells in Positron emission t ...

                                               

Soft water

Soft water is water which has relatively low concentration of calcium carbonate and other ions. It contains less than 85.5 parts per million of calcium carbonate. The water that lathers with soap easily is called or known as soft water. It descri ...

                                               

Solar eclipse of December 14, 2020

A total solar eclipse occured on Monday, December 14, 2020. A solar eclipse occurs when the Moon passes between Earth and the Sun, which will cover the image of the Sun for a viewer on Earth. A total solar eclipse happens when the Moons apparent ...

                                               

Solar eclipse of June 10, 2021

An annular solar eclipse will occur on June 10, 2021. A solar eclipse occurs when the Moon passes between Earth and the Sun, covering the image of the Sun for a viewer on Earth. An annular solar eclipse occurs when the Moons apparent diameter is ...

                                               

Solar eclipse of June 21, 2020

A solar eclipse occurs when the Moon passes between Earth and the Sun. An annular solar eclipse occurs when the Moons apparent diameter is smaller than the Suns, blocking most of the Suns light and causing the Sun to look like an annulus ring. Th ...

                                               

Solid-state drive

A solid-state drive is a data storage device, typically used in a computer. It uses flash memory to store data even after power is turned off. SSDs are designed to access data in the same way as traditional hard disk drives. A HDD can usually be ...

                                               

Solvent extraction

Solvent extraction, also known as Liquid–liquid extraction or partitioning, is a method to separate a compound based on the solubility of its parts. This is done using two liquids that dont mix, for example water and an organic solvent. Solvent e ...

                                               

Sorites paradox

Sorites paradox is a paradox that arises when unclear terms are used. The name of the paradox is related to the Greek word for heap. There are different versions, but a typical one involves a heap of sand. The heap is made of many grains of sand. ...

                                               

Source region

Source Region in meteorology is a region where air masses get their specific humidity and temperature. A source region could be land or water. It is called maritime and continental air masses if the air masses sit over water and land, respectively.

                                               

SpaceX Crew-1

SpaceX Crew-1 is the first crewed operational flight of a Crew Dragon spacecraft. The Crew Dragon spacecraft Resilience was expected to launch on 31 October 2020 on a Falcon 9 from the Kennedy Space Center, LC-39A. The launch was postponed due to ...

                                               

SpaceX Dragon 2

SpaceX Dragon 2 is a class of reusable spacecraft created by American aerospace manufacturer SpaceX as the replacement to the Dragon 1 cargo spacecraft. The spacecraft launches atop a Falcon 9 Block 5 rocket and returns to Earth via an ocean spla ...

                                               

Spherical coordinate system

A spherical coordinate system uses three numbers to identify a point in space.: Usually, two angles, and a distance from the origin of the coordinate system. If the point lies on the sphere, only the two angles are needed, because the distance fr ...

                                               

Spherical cow

A spherical cow is a metaphor that is used when a complex scientific model is made more simple than it really should be. The words "spherical cow" came from a joke where a dairy farmer talks to a theoretical physicist about how to get more prices ...

                                               

Sponde (moon)

Sponde or Jupiter XXXVI, is a moon of Jupiter. It was found by a team of astronomers from the University of Hawaii led by Scott S. Sheppard in 2001, and given the designation S/2001 J 5. Sponde is about 2 kilometres in diameter, and orbits Jupite ...

                                               

Spontaneous generation

The theory known as spontaneous generation held that complex, living organisms are generated by decaying organic substances. Mice might spontaneously appear in stored grain or maggots could spontaneously appear in meat. According to Aristotle it ...

                                               

Spontaneous symmetry breaking

Spontaneous symmetry breaking is a way symmetry breaks in a physical system. The underlying laws do not change, but the system as a whole changes. Symmetry breaking in physics occurs when a system is crossing a critical point. Small fluctuations ...

                                               

Star cluster

A star cluster is a group of stars. They are held together by mutual gravitation. They are related by common origin, and have similar or identical ages. In contrast, constellations and asterisms are just line-of-sight visual groups as seen from t ...

                                               

Statistical physics

Statistical physics is a branch of physics. It uses probability theory, statistics, and mathematical tools to solve certain physical problems. It can describe fields where objects or events seem to be random. It can be used for problems in physic ...

                                               

Steam

Steam is the name given to water when it is in a gas form. Steam is sometimes thought of as a cloud of translucent mist, however that is only the result of the steam condensing in the air, forming water vapor. Actual hot steam is invisible. When ...

                                               

Stellar precession

Stellar precession is one of the ways the stars slowly move across the sky when seen from the Earth. The best-known thing this causes is making the north stars place in the sky slowly change over thousands of years. It is caused by the Suns gravi ...

                                               

Stone (unit)

The stone is a unit for measuring mass in the Imperial system. It is equal to fourteen pounds. 160 stone make up a long ton. In the metric system, 1 stone = 6.35029318 kilograms. The short way of writing stones is st.

                                               

Stratosphere

The stratosphere is one of the layers of the atmosphere of the planet Earth. It extends from about 8 km above the poles to about 50 km. In the stratosphere, the temperature rises with increasing height. This makes the stratosphere very stable. Th ...

                                               

Strength of materials

The strength of materials is a topic important for the study of solids in many applications. It describes the mechanical behaviors of materials in response to forces that act on objects. Usually, the strength of a material is described with units ...

                                               

Summer

Summer is one of the four seasons. It is the hottest season of the year. In some places, summer is the wettest season, and in other places, it is a dry season. Four seasons are found in areas which are not too hot or too cold. Summer happens to t ...

                                               

Super glue

Super glue, or cyanoacrylate, is the general name for a family of fast-acting adhesives with industrial, medical and household uses. It usually comes in a small tube, and is often sold as "Super Glue" or "Krazy Glue". They are extremely strong gl ...

                                               

Superparamagnetism

Superparamagnetism is a form of magnetism. A superparamagnetic material has many small clusters of magnetic things in its structure, but they are not all pointed the same way, so the material is not magnetic by itself. If a magnetic field is appl ...

                                               

Superposition principle

In physics, the superposition principle states that if there are two or more stimuli at a given point in time, the response will be the result of adding all the responses. This only applies to linear systems. Since many systems can be modelled as ...

                                               

Surrogacy

Surrogacy means getting pregnant and carrying a child for other persons/person who will become the childs parents\parent after their birth. Some reasons why people may look for surrogacy is if a single man wants a child, pregnancy is too much of ...

                                               

Sustainable seafood

For thousands of years, people have caught and eaten fish and seafood. Today this has become a problem: The population has increased, and more fish and seafood need to be caught to feed all the people. This means that the populations of fish have ...

                                               

Suttungr (moon)

Suttungr or Saturn XXIII, is a moon of Saturn. It was found by Brett J. Gladman, et al. in 2000, and given the designation S/2000 S 12. Suttungr is about 5.6 kilometres in diameter, and orbits Saturn at an average distance of 19.667.000 km in 102 ...

                                               

Synchronous orbit

A synchronous orbit is an orbit in which an orbiting body has a period equal to the average rotational period of the body being orbited. Or in smaller words, the orbit above and the spinning planet below, go around once in the same amount of time ...

                                               

Talc

Talc is a silicate mineral, a type of clay. It is the standard for grade 1 in the Mohs scale of mineral hardness. A fingernail can easily scratch it. Talc is composed of hydrated magnesium silicate with the chemical formula Mg 3 Si 4 O 10 2. Talc ...

                                               

Tarqeq (moon)

Tarqeq or Saturn LII is a moon of Saturn. Its discovery was announced by Scott S. Sheppard, David C. Jewitt, Jan Kleyna, and Brian G. Marsden on April 13, 2007, from observations taken between January 5, 2006 and March 22, 2007. The semi-major ax ...

                                               

Tarvos (moon)

Tarvos or Saturn XXI is a non-spherical moon of Saturn. It was found by John J. Kavelaars, et al. on September 23, 2000, and given the designation S/2000 S 4. The name, given in August 2003, is after Tarvos from Gaulish mythology. Tarvos orbits S ...

                                               

Tata Institute of Fundamental Research

The Tata Institute of Fundamental Research is a research organization in India. It is for studies in mathematics and science. It is located in Mumbai. TIFR was started by Jenhangir Ratanji Dadabhoy Tata. It is now government funded. This institut ...

                                               

Tau lepton

Tau leptons are one of the very small elementary particles. This means that they are believed to be so small that they can not be divided any more. Tau leptons can be thought of as very heavy electrons, as they are both leptons. This is because t ...

                                               

Taurus (constellation)

Taurus is a constellation in the northern sky. "Taurus" means "bull" in Latin. It is a constellation of the zodiac, which means that it crosses the ecliptic. The astronomer named Ptolemy listed Taurus when he made a list of 48 constellations. It ...

                                               

Tautavel man

Tautavel man is the name of an extinct hominian. They lived about 300.000-450.000 years ago., It is named after fossils found in a cave on the site named Caune de lArago, near Tautavel, France. The first fossils were found there in 1971. The foss ...

                                               

Taygete (moon)

Taygete or Jupiter XX is a non-spherical moon of Jupiter. It was found by a team of astronomers from the University of Hawaii led by Scott S. Sheppard, et al. in 2000, and given the designation S/2000 J 9. Taygete is about 5 kilometres in diamete ...

                                               

Tethys Ocean

The Tethys Ocean existed between the continents of Gondwana and Laurasia during much of the Mesozoic era. Several smaller versions have existed down to the present day. Todays Black Sea, Caspian Sea, and Aral Sea are remnants of the Tethys.

                                               

Thalassa (moon)

Thalassa or Neptune IV, is the second closest moon to Neptune. It was named after a daughter of Aether and Hemera from Greek mythology. "Thalassa" is also the Greek word for "sea". Thalassa was discovered sometime before mid-September, 1989 from ...

                                               

Thelxinoe (moon)

Thelxinoe or Jupiter XLII is a moon of Jupiter. It was found by a team of astronomers from the University of Hawaii led by Scott S. Sheppard in 2004 from pictures taken in 2003, and originally got the designation S/2003 J 22. Thelxinoe is about 2 ...

                                               

Thermal conductivity

Thermal conductivity is the ability of a material to conduct heat. Metals are good at heat conduction. The thermal conductivity of a material is a defining property that aids in the development of effective heating/cooling technologies. A value f ...

                                               

Thermal power plant

A thermal power plant is a power plant where steam is used to drive a steam turbine. This turbine is connected to an electrical generator. After this, the water is condensed, and may be used again. This is known as the Rankine cycle. There are di ...

                                               

Thermosphere

The thermosphere is the fourth layer of the Earths atmosphere. It is directly above the mesosphere and directly below the exosphere. The name thermosphere is taken from the Greek word "thermos" which means heat. This layer has high temperatures b ...

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