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  2. Universe - Wikipedia

    en.wikipedia.org/wiki/Universe

    The universe is all of space and time [ a] and their contents. [ 10] It comprises all of existence, any fundamental interaction, physical process and physical constant, and therefore all forms of matter and energy, and the structures they form, from sub-atomic particles to entire galactic filaments. Space and time, according to the prevailing ...

  3. Observable universe - Wikipedia

    en.wikipedia.org/wiki/Observable_universe

    Dark matter (26.8%) Dark energy (68.3%) [ 6] The observable universe is a ball-shaped region of the universe consisting of all matter that can be observed from Earth or its space-based telescopes and exploratory probes at the present time; the electromagnetic radiation from these objects has had time to reach the Solar System and Earth since ...

  4. List of largest stars - Wikipedia

    en.wikipedia.org/wiki/List_of_largest_stars

    Overview. Although red supergiants are often considered the largest stars, some other star types have been found to temporarily increase significantly in radius, such as during LBV eruptions or luminous red novae. Luminous red novae appear to expand extremely rapidly, reaching thousands to tens of thousands of solar radii within only a few ...

  5. List of Solar System objects by size - Wikipedia

    en.wikipedia.org/wiki/List_of_Solar_System...

    Parts-per-million chart of the relative mass distribution of the Solar System, each cubelet denoting 2 × 10 24 kg. This article includes a list of the most massive known objects of the Solar System and partial lists of smaller objects by observed mean radius. These lists can be sorted according to an object's radius and mass and, for the most ...

  6. Chronology of the universe - Wikipedia

    en.wikipedia.org/wiki/Chronology_of_the_universe

    Therefore, the cosmic microwave background is a picture of the universe at the end of this epoch including the tiny fluctuations generated during inflation (see 9-year WMAP image), and the spread of objects such as galaxies in the universe is an indication of the scale and size of the universe as it developed over time. [55]

  7. Planck units - Wikipedia

    en.wikipedia.org/wiki/Planck_units

    Table 3: Today's universe in Planck units Property of present-day observable universe Approximate number of Planck units Equivalents Age: 8.08 × 10 60 t P: 4.35 × 10 17 s or 1.38 × 10 10 years Diameter: 5.4 × 10 61 l P: 8.7 × 10 26 m or 9.2 × 10 10 light-years: Mass: approx. 10 60 m P: 3 × 10 52 kg or 1.5 × 10 22 solar masses (only ...

  8. List of most massive stars - Wikipedia

    en.wikipedia.org/wiki/List_of_most_massive_stars

    A few notable large stars with masses less than 60 M☉ are shown in the table below for the purpose of comparison, ending with the Sun, which is very close, but would otherwise be too small to be included in the list. At present, all the listed stars are naked-eye visible and relatively nearby. Star name. Location.

  9. Solar System - Wikipedia

    en.wikipedia.org/wiki/Solar_System

    Earth (0.98–1.02 AU) [D 6] is the only place in the universe where life and surface liquid water are known to exist. [102] Earth's atmosphere contains 78% nitrogen and 21% oxygen, which is the result of the presence of life. [103] [104] The planet has a complex climate and weather system, with conditions differing drastically between climate ...