Welcome to Northwest Firearms
Join our community, sign up for free today!
Sign Up

star

A star is a luminous sphere of plasma held together by its own gravity. The nearest star to Earth is the Sun. Many other stars are visible to the naked eye from Earth during the night, appearing as a multitude of fixed luminous points in the sky due to their immense distance from Earth. Historically, the most prominent stars were grouped into constellations and asterisms, the brightest of which gained proper names. Astronomers have assembled star catalogues that identify the known stars and provide standardized stellar designations. However, most of the stars in the Universe, including all stars outside our galaxy, the Milky Way, are invisible to the naked eye from Earth. Indeed, most are invisible from Earth even through the most powerful telescopes.
For at least a portion of its life, a star shines due to thermonuclear fusion of hydrogen into helium in its core, releasing energy that traverses the star's interior and then radiates into outer space. Almost all naturally occurring elements heavier than helium are created by stellar nucleosynthesis during the star's lifetime, and for some stars, by supernova nucleosynthesis when it explodes. Near the end of its life, a star can also contain degenerate matter. Astronomers can determine the mass, age, metallicity (chemical composition), and many other properties of a star by observing its motion through space, its luminosity, and spectrum respectively. The total mass of a star is the main factor that determines its evolution and eventual fate. Other characteristics of a star, including diameter and temperature, change over its life, while the star's environment affects its rotation and movement. A plot of the temperature of many stars against their luminosities, produces a plot known as a Hertzsprung–Russell diagram (H–R diagram). The plotting of a particular star on that diagram allows the age and evolutionary state of that star to be determined.
A star's life begins with the gravitational collapse of a gaseous nebula of material composed primarily of hydrogen, along with helium and trace amounts of heavier elements. When the stellar core is sufficiently dense, hydrogen becomes steadily converted into helium through nuclear fusion, releasing energy in the process. The remainder of the star's interior carries energy away from the core through a combination of radiative and convective heat transfer processes. The star's internal pressure prevents it from collapsing further under its own gravity. When the hydrogen fuel at the core is exhausted, a star of mass 0.4 times greater than the Sun's will expand to become a red giant. In some cases, it will fuse heavier elements at the core or in shells around the core. As the star expands it throws a part of its mass, enriched with those heavier elements, into the interstellar environment, to be recycled later as new stars. Meanwhile, the core becomes a stellar remnant: a white dwarf, a neutron star, or if it is sufficiently massive a black hole.
Binary and multi-star systems consist of two or more stars that are gravitationally bound, and generally move around each other in stable orbits. When two such stars have a relatively close orbit, their gravitational interaction can have a significant impact on their evolution. Stars can form part of a much larger gravitationally bound structure, such as a star cluster or a galaxy.



View More On Wikipedia.org
  1. 9

    WTB WA  Star BM Mag(s)

    Just got a surplus BM, it was a decent deal because it was in parts and the owner couldn't assemble it. Looking for at least one, but obviously ultimately want more. I assembled the gun, but have no way to test. Have cash or trades. TIA!
  2. RicInOR

    RIP Louis Levi Oakes - Last Native American Code Talker (Silver Star)

    Louis Levi Oakes ,Company B 442nd Signal Battalion U.S. Army and the last native American code talker,dies at the age 94
  3. 9

    Star Firestar M45

    45ACP, steel on steel, one of the first compact carry pieces. Star Firearms : Firestar Series Pistols Star Firestar M45 Review: Don't Let It Go - Guns.com Comes with a ton of spare parts (firing pin, pins, hammers, whole bunch), 2 original magazines. Runs like a champ, doesn't care what ammo...
  4. F

    Star 9mm cheap

    Star Model BM SA 9mm Semi-Auto, 4" barrel, 8 Rd Mag, Original Box - Surplus - Good / Very Good Overall. - Semi-Auto - Hand Guns
  5. Naterbug341

    Star BM

    Have a Star BM 9mm, was a LEO trade in from Spain. Comes with original box, cleaning rod, and two magazines. Has officers last initial carved in the slide. Looking for compact or full size handguns. Can throw in with my other firearms posted for a trade. Price:$200
  6. clanhanson

    Star BM x2 w/3 Magazines

    Selling two Star BM 9mm 1911 handguns with three original magazines. Includes original boxs and tools, one lock, and one user manual. Both manufactured in 1977. Magazine safety is disabled on one, with the other having an easily removed mag safety if desired. One is in good condition with...
  7. Cavedweller

    Other State  Porn star surrenders gun in publicity stunt

    Porn Star Gives Up Her Gun In Virtue Signaling Stunt Parroting Democrat Talking Points