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  2. Category:Timeline of spaceflight templates - Wikipedia

    en.wikipedia.org/wiki/Category:Timeline_of...

    [[Category:Timeline of spaceflight templates]] to the <includeonly> section at the bottom of that page. Otherwise, add <noinclude>[[Category:Timeline of spaceflight templates]]</noinclude> to the end of the template code, making sure it starts on the same line as the code's last character.

  3. Timeline of knowledge about galaxies, clusters of galaxies ...

    en.wikipedia.org/wiki/Timeline_of_knowledge...

    5th century BC – Democritus proposes that the bright band in the night sky known as the Milky Way might consist of stars. 4th century BC – Aristotle believes the Milky Way to be caused by "the ignition of the fiery exhalation of some stars which were large, numerous and close together" and that the "ignition takes place in the upper part of the atmosphere, in the region of the world which ...

  4. Template:Spaceflight lists and timelines - Wikipedia

    en.wikipedia.org/wiki/Template:Spaceflight_lists...

    Place {{Spaceflight lists and timelines}} at the end of an article, but above any categories.. This template's initial visibility currently defaults to autocollapse, meaning that if there is another collapsible item on the page (a navbox, sidebar, or table with the collapsible attribute), it is hidden apart from its title bar; if not, it is fully visible.

  5. Chronology of the universe - Wikipedia

    en.wikipedia.org/wiki/Chronology_of_the_universe

    The first generation of stars, known as Population III stars, formed within a few hundred million years after the Big Bang. [62] These stars were the first source of visible light in the universe after recombination. Structures may have begun to emerge from around 150 million years, and early galaxies emerged from around 180 to 700 million years.

  6. Timeline of space exploration - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_space_exploration

    This is a timeline of space exploration which includes notable achievements, first accomplishments and milestones in humanity's exploration of outer space.. This timeline generally does not distinguish achievements by a specific country or private company, as it considers humanity as a whole.

  7. Wikipedia:WikiProject Spaceflight/Timeline of spaceflight ...

    en.wikipedia.org/wiki/Wikipedia:WikiProject...

    Page naming should follow the format [Year] in spaceflight, replacing "[year]" with the year that the list is documenting.(eg. 2024 in spaceflight) . In order to facilitate consistency throughout the timeline, the D MMMM (day-month) long date format should be used within articles, for example 28 October.

  8. Spacetime diagram - Wikipedia

    en.wikipedia.org/wiki/Spacetime_diagram

    The original position on your time line (ct) is perpendicular to position A, the original position on your mutual timeline (x) where (t) is zero. This timeline where timelines come together are positioned then on the same timeline even when there are 2 different positions. The 2 positions are on the 45 degree Event line on the original position ...

  9. 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

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