sports

  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   energy   and   matter , and the structures they form, from   sub-atomic particles   to entire   galactic filaments . Space and time, according to the prevailing   cosmological   theory of the   Big Bang , emerged together   13.787 ± 0.020 billion years   ago, [11]   and the   universe has been expanding   ever since. Today the universe has expanded into an age and size that is physically only in parts observable as the   observable universe , which is approximately 93 billion   light-years   in diameter at the present day, while the spatial size, if any, of the entire universe is unknown. [3] Some of the earliest...

  Earth   is the third   planet   from the   Sun   and the only   astronomical object   known to   harbor life . This is enabled by Earth being an   ocean world , the only one in the   Solar System   sustaining liquid   surface water . Almost all of Earth's water is contained in its global ocean, covering   70.8%   of   Earth's crust . The remaining 29.2% of Earth's crust is land, most of which is located in the form of   continental   landmasses   within Earth's   land hemisphere . Most of Earth's land is somewhat   humid   and covered by vegetation, while large   sheets of ice   at   Earth's polar   deserts   retain more water than Earth's   groundwater , lakes, rivers and   atmospheric water   combined. Earth's crust consists of slowly moving   tectonic plates , which interact to produce mountain ranges,   volcanoes , and eart...