A supernova is a powerful and luminous explosion of a star. A supernova occurs during the last evolutionary stages of a massive star, or when a white dwarf is triggered into runaway nuclear fusion. The original object, called the progenitor, either collapses to a neutron star or black hole, or is completely destroyed to form a diffuse nebula. The peak optical luminosity of a supernova can be comparable to that of an entire galaxy before fading over several weeks or months.
The tiger is a large cat and a member of the genus Panthera native to Asia. It has a powerful, muscular body with a large head and paws, a long tail and orange fur with black, mostly vertical stripes. It is traditionally classified into nine recent subspecies, though some recognise only two subspecies, mainland Asian tigers and the island tigers of the Sunda Islands.
Hubble's law, also known as the Hubble–Lemaître law, is the observation in physical cosmology that galaxies are moving away from Earth at speeds proportional to their distance, i.e. the farther they are, the faster they are moving away. For this purpose, the recessional velocity of a galaxy is typically determined by measuring redshift, a shift in the light it emits toward the red end of the visible light spectrum.
The leopard is one of the five extant cat species in the genus Panthera. It has a pale yellowish to dark golden fur with dark spots grouped in rosettes. Its body is slender and muscular reaching a length of 92–183 cm (36–72 in) with a 66–102 cm (26–40 in) long tail and a shoulder height of 60–70 cm (24–28 in). Males typically weigh 30.9–72 kg (68–159 lb), and females 20.5–43 kg (45–95 lb).
Newton's laws of motion are three physical laws that describe the relationship between the motion of an object and the forces acting on it. These laws, which provide the basis for Newtonian mechanics, can be paraphrased as follows:
- A body remains at rest, or in motion at a constant speed in a straight line, except insofar as it is acted upon by a force.
- At any instant of time, the net force on a body is equal to the body's acceleration multiplied by its mass or, equivalently, the rate at which the body's momentum is changing with time.
- If two bodies exert forces on each other, these forces have the same magnitude but opposite directions.
The Black–Scholes or Black–Scholes–Merton model is a mathematical model for the dynamics of a financial market containing derivative investment instruments. From the parabolic partial differential equation in the model, known as the Black–Scholes equation, one can deduce the Black–Scholes formula, which gives a theoretical estimate of the price of European-style options and shows that the option has a unique price given the risk of the security and its expected return. The equation and model are named after economists Fischer Black and Myron Scholes. Robert C. Merton, who first wrote an academic paper on the subject, is sometimes also credited.
Taravana is a disease often found among Polynesian island natives who habitually dive deep without breathing apparatus many times in close succession, usually for food or pearls. These free-divers may make 40 to 60 dives a day, each of 30 or 40 metres.
The University of Illinois Press (UIP) is an American university press and is part of the University of Illinois system. Founded in 1918, the press publishes some 120 new books each year, plus 33 scholarly journals, and several electronic projects. Strengths include ethnic and multicultural studies, Lincoln and Illinois history, and the large and diverse series Music in American Life.
Enzyme kinetics is the study of the rates of enzyme-catalysed chemical reactions. In enzyme kinetics, the reaction rate is measured and the effects of varying the conditions of the reaction are investigated. Studying an enzyme's kinetics in this way can reveal the catalytic mechanism of this enzyme, its role in metabolism, how its activity is controlled, and how a drug or a modifier might affect the rate.
Aulua or Aulua Bay is an Oceanic language spoken in east Malekula, Vanuatu.
The University of Texas Press is a university press that is part of the University of Texas at Austin. Established in 1950, the Press publishes scholarly books and journals in several areas, including Latin American studies, Texana, anthropology, U.S. Latino studies, Native American studies, African American studies, film & media studies, classics and the ancient Near East, Middle East studies, natural history, art, and architecture. The Press also publishes trade books and journals relating to their major subject areas.
The Journal of Vertebrate Paleontology is a bimonthly peer-reviewed scientific journal that was established in 1980 by Jiri Zidek. It covers all aspects of vertebrate paleontology, including vertebrate origins, evolution, functional morphology, taxonomy, biostratigraphy, paleoecology, paleobiogeography, and paleoanthropology. The journal is published by Taylor & Francis on behalf of the Society of Vertebrate Paleontology. According to Journal Citation Reports, the journal has a 2017 impact factor of 2.190.
The Geological Society of South Africa (GSSA) is a learned society for geological science that was founded in 1895, making it one of the oldest such societies in Africa. The GSSA publishes the peer-reviewed scientific journal, the South African Journal of Geology, and annually awards the Draper Memorial Medal to recognise achievement in geology, and the Des Pretorius Memorial Award to recognise exceptional work on economic geology in Africa. The GSSA collaborates internationally with other professional organizations such as the European Federation of Geologists (EFG).
Viscosity is a measure of a fluid's dynamic resistance to a change in shape or to movement of its neighboring portions relative to one another. For liquids, it corresponds to the informal concept of thickness; for example, syrup has a higher viscosity than water. Viscosity is defined scientifically as a force multiplied by a time divided by an area. Thus its SI units are newton-seconds per square meter, or pascal-seconds.
Plasma is one of four fundamental states of matter characterized by the presence of a significant portion of charged particles in any combination of ions or electrons. It is the most abundant form of ordinary matter in the universe, mostly in stars, but also dominating the rarefied intracluster medium and intergalactic medium. Plasma can be artificially generated, for example, by heating a neutral gas or subjecting it to a strong electromagnetic field.
The Bulgarian Scenthound is a dog breed from Bulgaria. It originated in the Ludogorie region of northern Bulgaria, and is the most widely distributed smooth-haired hunting dog in Bulgaria. It is a non-standardised breed but conforms to hound body morphology.
Mutu, or Tuam (Mutu-Tuam), is an Austronesian language of Morobe Province, Papua New Guinea.
Pelanserin (TR2515) is a chemical compound that acts as an antagonist of the 5-HT2 and α1-adrenergic receptors.
N VBI-2902 is a COVID-19 vaccine candidate developed by Variation Biotechnologies from the United States.
