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  2. Q star - Wikipedia

    en.wikipedia.org/wiki/Q_star

    A Q-star, also known as a grey hole, is a hypothetical type of a compact, heavy neutron star with an exotic state of matter. Such a star can be smaller than the progenitor star's Schwarzschild radius and have a gravitational pull so strong that some light, but not all photons, can escape.

  3. Hypothetical star - Wikipedia

    en.wikipedia.org/wiki/Hypothetical_star

    The very earliest stars, virtually free of metals, believed to have existed in the early universe when the only common elements were primordial hydrogen and helium. none: Preon star: A star with a core composed of preons. none: Q star (grey hole) A compact, heavy neutron star with an exotic state of matter where most light does not escape the ...

  4. 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

  5. Compact object - Wikipedia

    en.wikipedia.org/wiki/Compact_object

    The usual endpoint of stellar evolution is the formation of a compact star.. All active stars will eventually come to a point in their evolution when the outward radiation pressure from the nuclear fusions in its interior can no longer resist the ever-present gravitational forces.

  6. Timeline of Solar System astronomy - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_Solar_System...

    c. 560 BCE – Anaximander is arguably the first to conceive a mechanical model of the world, although highly inaccurate: a cylindrical Earth [11] floats freely in space surrounded by three concentric wheels turning at different distances: the closest for the stars and planets, the second for the Moon and the farthest for the Sun, all conceived ...

  7. 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 ...

  8. It's winter in Stars Hollow! Stroll through the 'Gilmore ...

    www.aol.com/news/winter-stars-hollow-stroll...

    From Dec. 18 to Jan. 5, a portion of the studio's backlot will be remade into the fictional town of Stars Hollow, Conn., with looks at key filming locations and props, as well as costume contests ...

  9. 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 ...