THE RING NEBULA LYRE M57 (Charles MESSIER) IN THE LYRE CONSTELLATION. One of the most well-known and most watched objects by observers. It is a planetary nebula, a relic of a star at the end of its life whose gases expulsed a few thousand years ago appear to us in the form of a remarkable ring. Small, it is also bright and quite easy to point, it is truly one of the stars of the summer sky. Lyra located in the northern hemisphere, its main star is Vega of color bluish, is part of the asterisks of the summer triangle, it is in this constellation that is M57 in the shape of a ring. https://platform.wise.art/author/robert-2/ http://astroliva.ch/