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  2. Stellar parallax - Wikipedia

    en.wikipedia.org/wiki/Stellar_parallax

    Stellar parallax is most often measured using annual parallax, defined as the difference in position of a star as seen from Earth and Sun, i.e. the angle subtended at a star by the mean radius of Earth's orbit around the Sun. The parsec (3.26 light-years) is defined as the distance for which the annual parallax is 1 arcsecond. Annual parallax ...

  3. Stellar evolution - Wikipedia

    en.wikipedia.org/wiki/Stellar_evolution

    Representative lifetimes of stars as a function of their masses The change in size with time of a Sun-like star Artist's depiction of the life cycle of a Sun-like star, starting as a main-sequence star at lower left then expanding through the subgiant and giant phases, until its outer envelope is expelled to form a planetary nebula at upper right Chart of stellar evolution

  4. Parallax - Wikipedia

    en.wikipedia.org/wiki/Parallax

    For example, the distance from the Sun to Proxima Centauri is 1/0.7687 = 1.3009 parsecs (4.243 ly), and a celestial object which distance is twice than this star has the half parallax 0.65045 [6] On Earth, a coincidence rangefinder or parallax rangefinder can be used to find distance to a target.

  5. Parallax in astronomy - Wikipedia

    en.wikipedia.org/wiki/Parallax_in_astronomy

    A parsec is the distance from the Sun to an astronomical object that has a parallax angle of one arcsecond (not to scale). The parsec (symbol: pc) is a unit of length used to measure the large distances to astronomical objects outside the Solar System, approximately equal to 3.26 light-years or 206,265 astronomical units (AU), i.e. 30.9 trillion kilometres (19.2 trillion miles).

  6. Alpha Centauri - Wikipedia

    en.wikipedia.org/wiki/Alpha_Centauri

    In August 2015, the largest recorded flares of the star occurred, with the star becoming 8.3 times brighter than normal on 13 August, in the B band (blue light region). [ 60 ] Alpha Centauri may be inside the G-cloud of the Local Bubble , [ 61 ] and its nearest known system is the binary brown dwarf system Luhman 16 , at 3.6 light-years (1.1 ...

  7. Astronomers used NASA's James Webb Space Telescope to reveal 44 stars in a galaxy so far away, its light dates to when the universe was half its age. In 'groundbreaking' study, astronomers detect ...

  8. List of the most distant astronomical objects - Wikipedia

    en.wikipedia.org/wiki/List_of_the_most_distant...

    This article documents the most distant astronomical objects discovered and verified so far, and the time periods in which they were so classified. For comparisons with the light travel distance of the astronomical objects listed below, the age of the universe since the Big Bang is currently estimated as 13.787±0.020 Gyr.

  9. 2017 deemed deadliest year for mass shootings in modern US ...

    www.aol.com/news/2017-deemed-deadliest-mass...

    The Gun Violence Archive, which defines a mass shooting as four or more people shot in one incident (not including the shooter), reports more than 14,000 people killed and over 29,000 injured in 2017.