The term "faint blue galaxy" typically refers to a type of galaxy that appears blue and has a relatively low brightness. These galaxies are often observed in deep-sky surveys and are characterized by their blue color, which indicates active star formation. Here are a few key points about faint blue galaxies: 1. **Color and Composition**: The blue color of these galaxies often arises from the presence of hot, young stars, which emit significant amounts of blue and ultraviolet light.
The outline of galaxies generally refers to the structure, classification, and characteristics of galaxies in the universe. Here’s a basic outline that encompasses the essential features of galaxies: ### 1. **Definition of a Galaxy** - A galaxy is a massive system that consists of stars, star clusters, planetary systems, gas, dust, and dark matter, all bound together by gravity. ### 2.
The "sphere of influence" of a black hole refers to the region around the black hole where its gravitational influence dominates over the gravitational influences of other surrounding celestial bodies. In more specific terms, it is the area within which the gravitational pull of the black hole is strong enough to significantly affect the motion of objects, such as stars or gas, compared to other gravitational sources in the vicinity (like other stars or galaxies).
The term "Sunburst Galaxy" can refer to a specific type of galaxy or a specific galaxy that exhibits certain features, but it is not a broadly used classification in astronomy. It is sometimes associated with the galaxy known as IC 1151, which is notable for its distinctive appearance that resembles a sunburst pattern due to its spiral arms and the way it emits light. Galaxies are typically classified into various types, such as spiral, elliptical, and irregular.
Ultra diffuse galaxies (UDGs) are a class of galaxies that are characterized by their low surface brightness and large size. Despite having a similar mass to typical galaxies, UDGs have a flattened, diffuse structure with a low density of stars spread over a large area. They are often difficult to detect with standard observational techniques due to their faintness and diffusive nature.
F-Spot is a free and open-source photo management application designed for the Linux operating system. It serves as an image organizer and provides users with features for importing, organizing, editing, and sharing photos. Key features of F-Spot include: 1. **Photo Import:** Users can easily import photos from digital cameras and other devices. 2. **Organization:** It allows for tagging, categorizing, and managing images through a user-friendly interface, helping to keep collections organized.
The Grogs is not a widely recognized term or concept as of my last update in October 2023. It could potentially refer to different things depending on context, such as a brand name, a fictional group or character, or a slang term.
Electromagnetic propulsion is a technology that uses electromagnetic forces to propel an object, typically a vehicle or spacecraft. It relies on the interaction between electric and magnetic fields to generate thrust, allowing for efficient and often high-speed movement. There are several types of electromagnetic propulsion systems, each with different principles and applications. ### Key Types of Electromagnetic Propulsion: 1. **Electromagnetic Railguns**: These use electromagnetic forces to accelerate a projectile along a pair of conductive rails.
The plastics industry encompasses the design, production, and sale of plastic materials and products. It involves various processes and techniques to transform raw plastic polymers into finished goods that can be used in a multitude of applications across different sectors. Here are some key aspects of the plastics industry: 1. **Raw Materials**: The plastics industry primarily relies on petrochemicals derived from crude oil and natural gas.
CR-39, also known as allyl diglycol carbonate, is a type of thermosetting polymer primarily used in the production of optical lenses, such as eyeglass lenses and safety goggles. It is valued for its lightweight properties, optical clarity, and ability to withstand scratches and impact. CR-39 was developed in the 1940s and has since become one of the most common materials for prescription lenses due to its combination of strength, affordability, and ease of manufacturing.
Ethylene vinyl alcohol (EVOH) is a type of copolymer composed of ethylene and vinyl alcohol. It is known for its excellent barrier properties, particularly against gases and aromas, making it highly valued in packaging applications.
Poly(ethyl methacrylate) (PEMA) is a synthetic polymer made from the polymerization of ethyl methacrylate monomers. It is a member of the methacrylate family, which includes various acrylic polymers, and is known for its versatility and utility in a variety of applications. ### Properties of Poly(ethyl methacrylate): 1. **Transparency**: PEMA is typically clear and can be made to have various levels of transparency and color.
Splay, in the context of plastics, refers to a defect that can occur during the injection molding process. It manifests as a flow pattern or streak in the finished molded part, often caused by the flow of the molten plastic during processing. Splay can result in an unsightly appearance and may impact the mechanical properties of the final product.
Trinseo is a global materials company that specializes in the production of plastics, latex binders, and synthetic rubber. It was formed in 2010 as a spin-off from the chemical company Dow Chemical. Trinseo offers a range of products used in various industries, including automotive, packaging, consumer goods, and construction. The company is known for its focus on sustainability and innovation, working to develop materials that are not only high-performance but also environmentally friendly.
Vespel is a brand name for a series of high-performance polyimide materials developed by DuPont. These materials are known for their excellent thermal stability, chemical resistance, and mechanical properties. Vespel is often used in applications that require materials to maintain their integrity under high temperatures, such as in aerospace, automotive, and electrical industries. Vespel components can be found in various forms, including sheets, rods, and custom machined parts.
Resin sculptures are artworks created using synthetic resin, a versatile material that can be molded, cast, and manipulated in various ways. Resin is typically composed of a combination of polymers that can be formulated to achieve different properties, allowing artists to create intricate designs, vibrant colors, and unique finishes.
Benzoin is a resin obtained from the bark of trees belonging to the Styrax genus, particularly Styrax benzoin. The resin has a long history of use in traditional medicine, incense, and as a fixative in perfumery due to its aromatic properties. Benzoin contains compounds such as benzoic acid, and it emits a sweet, vanilla-like fragrance when burned.
Canarium luzonicum, commonly known as the Philippine almond tree or luzon almond, is a species of tree in the family Burseraceae. It is native to the Philippines and is notable for its hardwood, which is used in various applications, including furniture and construction. The tree produces edible nuts that are often consumed locally and valued for their nutritional content. Canarium luzonicum grows in tropical climates and is associated with forests, often found at low to moderate elevations.
Labdanum is a fragrant resin obtained from various species of the Cistus plant, particularly Cistus ladanifer and Cistus creticus. It has been used since ancient times for its aromatic properties and is commonly found in perfumes, incense, and traditional medicine. The resin has a rich, warm, and slightly sweet scent, often described as amber-like, with notes that can remind one of leather or musk.
Mummia, often referred to as "mumia," is a historical term that originally referred to a type of embalming substance used in ancient mummification processes. The term is derived from the Arabic word "mūmyāʔ," which means "bitumen" or "asphalt," and it was believed that this substance had preservative qualities.

Pinned article: Introduction to the OurBigBook Project

Welcome to the OurBigBook Project! Our goal is to create the perfect publishing platform for STEM subjects, and get university-level students to write the best free STEM tutorials ever.
Everyone is welcome to create an account and play with the site: ourbigbook.com/go/register. We belive that students themselves can write amazing tutorials, but teachers are welcome too. You can write about anything you want, it doesn't have to be STEM or even educational. Silly test content is very welcome and you won't be penalized in any way. Just keep it legal!
We have two killer features:
  1. topics: topics group articles by different users with the same title, e.g. here is the topic for the "Fundamental Theorem of Calculus" ourbigbook.com/go/topic/fundamental-theorem-of-calculus
    Articles of different users are sorted by upvote within each article page. This feature is a bit like:
    • a Wikipedia where each user can have their own version of each article
    • a Q&A website like Stack Overflow, where multiple people can give their views on a given topic, and the best ones are sorted by upvote. Except you don't need to wait for someone to ask first, and any topic goes, no matter how narrow or broad
    This feature makes it possible for readers to find better explanations of any topic created by other writers. And it allows writers to create an explanation in a place that readers might actually find it.
    Figure 1.
    Screenshot of the "Derivative" topic page
    . View it live at: ourbigbook.com/go/topic/derivative
  2. local editing: you can store all your personal knowledge base content locally in a plaintext markup format that can be edited locally and published either:
    This way you can be sure that even if OurBigBook.com were to go down one day (which we have no plans to do as it is quite cheap to host!), your content will still be perfectly readable as a static site.
    Figure 2.
    You can publish local OurBigBook lightweight markup files to either https://OurBigBook.com or as a static website
    .
    Figure 3.
    Visual Studio Code extension installation
    .
    Figure 4.
    Visual Studio Code extension tree navigation
    .
    Figure 5.
    Web editor
    . You can also edit articles on the Web editor without installing anything locally.
    Video 3.
    Edit locally and publish demo
    . Source. This shows editing OurBigBook Markup and publishing it using the Visual Studio Code extension.
    Video 4.
    OurBigBook Visual Studio Code extension editing and navigation demo
    . Source.
  3. https://raw.githubusercontent.com/ourbigbook/ourbigbook-media/master/feature/x/hilbert-space-arrow.png
  4. Infinitely deep tables of contents:
    Figure 6.
    Dynamic article tree with infinitely deep table of contents
    .
    Descendant pages can also show up as toplevel e.g.: ourbigbook.com/cirosantilli/chordate-subclade
All our software is open source and hosted at: github.com/ourbigbook/ourbigbook
Further documentation can be found at: docs.ourbigbook.com
Feel free to reach our to us for any help or suggestions: docs.ourbigbook.com/#contact