The Hubble Space Telescope
It is a telescope developed by NASA * and a participation of the European Space Agency *.
Its launch took place on April 24, 1990 by the shuttle Discovery.
Its large mirror (2.4 meters in diameter), which allows it to render images with an angular resolution less than 0.1 second of arc and its ability to observe using imagers and spectroscopes in the near-infrared and the ultraviolet, it allows him to outclass, for many types of observation, the most powerful ground-based instruments, handicapped by the presence of the Earth's atmosphere.
Origin of the name of the telescope "Hubble": it is a tribute to the father of the theory of relativity and the "discoverer of the big bang" * but also because it is a satellite that explores many sources (neutron stars, black holes).
Its mission is to determine the rate of expansion and the age of the universe.
Hubble law: the greater the distance of a galaxy, the more the spectral lines are shifted towards the red.
Thanks to the law of expansion * of the Hubble universe manages to highlight that the universe can be compared to the model that Friedman and Lemaître had established in theory *.
Hubble's Notions for the Astronomical Future: The Milky Way is not the only galaxy in the universe, there are an unlimited number of galaxies that are further away from each other.
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NASA *: (National Aeronautical and Space Administration) is a government agency responsible for the major part of the United States civilian space program.
European Space Agency *: (ESA) is an intergovernmental space agency coordinating space projects jointly conducted by some 20 European countries.
Big Bang *: it is a cosmological model used by scientists to describe the evolution and origin of the universe.
Expansion: it is a phenomenon which sees on large scales the objects composing the universe to move away from each other.
Friedman and Lemaître's theory: a universe that begins with a primary explosion and is expanding for hundreds of billions of years or forever.