A molecular cloud, sometimes called a stellar nursery (if star formation is occurring within), is a type of interstellar cloud, the density and size of which permit absorption nebulae, the formation of molecules (most commonly molecular hydrogen, H2), and the formation of H II regions. This is in contrast to other areas of the interstellar medium that contain predominantly ionized gas.
Kathryn Janeway is a fictional character in the Star Trek franchise. She was the main character of the television series Star Trek: Voyager, which aired between 1995 and 2001. She served as the captain of the Starfleet starship USS Voyager while it was lost in the Delta Quadrant on the other side of the galaxy. After returning home to the Alpha Quadrant, she is promoted to vice admiral and briefly appears in the 2002 film Star Trek: Nemesis. She is seen again commanding the USS Dauntless in Star Trek: Prodigy, searching for the missing USS Protostar which was being commanded by Captain Chakotay, her former first officer on Voyager, at the time of its disappearance.
Star formation is the process by which dense regions within molecular clouds in interstellar space, sometimes referred to as "stellar nurseries" or "star-forming regions", collapse and form stars. As a branch of astronomy, star formation includes the study of the interstellar medium (ISM) and giant molecular clouds (GMC) as precursors to the star formation process, and the study of protostars and young stellar objects as its immediate products. It is closely related to planet formation, another branch of astronomy. Star formation theory, as well as accounting for the formation of a single star, must also account for the statistics of binary stars and the initial mass function. Most stars do not form in isolation but as part of a group of stars referred as star clusters or stellar associations.
In the fictional universe of Star Trek, the Prime Directive is a guiding principle of Starfleet that prohibits its members from interfering with the natural development of alien civilizations. Its stated aim is to protect unprepared civilizations from the danger of starship crews introducing advanced technology, knowledge, and values before they are ready. Since its introduction in the first season of the original Star Trek series, the directive has featured in many Star Trek episodes as part of a moral question over how best to establish diplomatic relations with new alien worlds.
A protostar is a very young star that is still gathering mass from its parent molecular cloud. It is the earliest phase in the process of stellar evolution. For a low-mass star, it lasts about 500,000 years. The phase begins when a molecular cloud fragment first collapses under the force of self-gravity and an opaque, pressure-supported core forms inside the collapsing fragment. It ends when the infalling gas is depleted, leaving a pre-main-sequence star, which contracts to later become a main-sequence star at the onset of hydrogen fusion producing helium.
The Kobayashi Maru is a training exercise in the Star Trek franchise designed to test the character of Starfleet Academy cadets by placing them in a no-win scenario. The Kobayashi Maru test was first depicted in the 1982 film Star Trek II: The Wrath of Khan, and it has since been referred to and depicted in numerous other Star Trek media.
The Toyota Corona is an automobile manufactured by the Japanese automaker Toyota across eleven generations between 1957 and 2001. On launch, the Corona was Toyota's second-highest product in their range, just below the Crown. The Corona was marketed in the JDM at Toyota's Toyopet Store dealership channels, and the Corona was one of Toyota's first models exported to other global markets, followed by the smaller Toyota Corolla.
Herbig–Haro (HH) objects are bright patches of nebulosity associated with newborn stars. They are formed when narrow jets of partially ionised gas ejected by stars collide with nearby clouds of gas and dust at several hundred kilometres per second. Herbig–Haro objects are commonly found in star-forming regions, and several are often seen around a single star, aligned with its rotational axis. Most of them lie within about one parsec of the source, although some have been observed several parsecs away. HH objects are transient phenomena that last around a few tens of thousands of years. They can change visibly over timescales of a few years as they move rapidly away from their parent star into the gas clouds of interstellar space. Hubble Space Telescope observations have revealed the complex evolution of HH objects over the period of a few years, as parts of the nebula fade while others brighten as they collide with the clumpy material of the interstellar medium.
A flare star is a variable star that can undergo unpredictable dramatic increases in brightness for a few minutes. It is believed that the flares on flare stars are analogous to solar flares in that they are due to the magnetic energy stored in the stars' atmospheres. The brightness increase is across the spectrum, from X-rays to radio waves. Flare activity among late-type stars was first reported by A. van Maanen in 1945, for WX Ursae Majoris and YZ Canis Minoris. However, the best-known flare star is UV Ceti, first observed to flare in 1948. Today similar flare stars are classified as UV Ceti type variable stars in variable star catalogs such as the General Catalogue of Variable Stars.
A pre-main-sequence star is a star in the stage when it has not yet reached the main sequence. Earlier in its life, the object is a protostar that grows by acquiring mass from its surrounding envelope of interstellar dust and gas. After the protostar blows away this envelope, it is optically visible, and appears on the stellar birthline in the Hertzsprung-Russell diagram. At this point, the star has acquired nearly all of its mass but has not yet started hydrogen burning. The star continues to contract, its internal temperature rising until it begins hydrogen burning on the zero age main sequence. This period of contraction is the pre-main sequence stage. An observed PMS object can either be a T Tauri star, if it has fewer than 2 solar masses (M☉), or else a Herbig Ae/Be star, if it has 2 to 8 M☉. Yet more massive stars have no pre-main-sequence stage because they contract too quickly as protostars. By the time they become visible, the hydrogen in their centers is already fusing and they are main-sequence objects.
Young stellar object (YSO) denotes a star in its early stage of evolution. This class consists of two groups of objects: protostars and pre-main-sequence stars.
W33A is a protostar located approximately 12,000 light-years away from Earth, in the constellation Sagittarius. As a star in the early stages of formation, so has attracted the interest of astronomers, who observed that while the protostar is accumulating material from surrounding clouds of gas and dust, it is simultaneously ejecting fast moving jets of particles from its north and south poles.
Corona Data Systems, later renamed Cordata, was an American personal computer company. It was one of the earliest IBM PC compatible computer system companies. Manufacturing was primarily done by Daewoo of Korea, which became a major investor in the company and ultimately the owner.
IRAS 18162-2048 is a far-infrared source discovered by IRAS spacecraft in 1983. It is associated with a massive protostar, which accretes gas from a disk that surrounds it. IRAS 18162-2048 emits two collimated radio jets along its axis of rotation. The jets are made of chains of radio sources aligned in a southwest-northeast direction. The northern jet terminates in Herbig–Haro object HH 81N, while the southern one terminates in Herbig–Haro objects HH 80 and HH 81. The total luminosity of IRAS 18162-2048 is about 17,000 solar luminosities. The total extent of this system of jets and radio sources is about 5 pc.
Ullmann's Encyclopedia of Industrial Chemistry is a major reference work related to industrial chemistry by chemist Fritz Ullmann, first published in 1914, and exclusively in German as "Enzyklopädie der Technischen Chemie" until 1984.
Scott Jay Kenyon is an American astrophysicist. His work has included advances in symbiotic and other types of interacting binary stars, the formation and evolution of stars, and the formation of planetary systems.
LRLL 54361 also known as L54361 is thought to be a binary protostar producing strobe-like flashes, located in the constellation Perseus in the star-forming region IC 348 and 950 light-years away.
Star Trek vs. Transformers is a five-issue comic book limited series published by IDW Publishing. It is a crossover between the Star Trek and Transformers franchises, using the characters and art styles from the 1973 cartoon Star Trek: The Animated Series and the 1984 cartoon Transformers The first issue was released in September 2018. The comic was issued as a five part mini-series and has met with favorable reviews for mixing the two science fiction universes. In particular, they praised artist Philip Murphy artistic style with character's which were compared to cel animation.
Star Trek: Prodigy is an American animated science fiction television series created by Kevin and Dan Hageman. It is the tenth Star Trek series and debuted in 2021 as part of executive producer Alex Kurtzman's expanded Star Trek Universe. Prodigy is the first Star Trek series to specifically target a younger audience, and the franchise's first solely 3D animated series. It follows a group of young aliens in the 24th century who find the abandoned starship Protostar and learn about Starfleet.
The dark nebula Barnard 203 or Lynds 1448 is located about one degree southwest of NGC 1333 in the Perseus molecular cloud, at a distance of about 800 light-years. Three infrared sources were observed in this region by IRAS, called IRS 1, IRS 2 and IRS 3.
