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In physical cosmology, the age of the universe is the time elapsed since the Big Bang: 13.8 billion years. [1] Astronomers have two different approaches to determine the age of the universe . One is based on a particle physics model of the early universe called Lambda-CDM , matched to measurements of the distant, and thus old features, like the ...
13.6–13.5 billion years (300-200 Mya): Sirius, the brightest star in the Earth's sky, forms. 13.7 billion years (100 Mya): Formation of Pleiades Star Cluster; 13.73 billion years (70 Mya): North Star, Polaris, one of the significant navigable stars, forms; 13.780 billion years (20 Mya): Possible formation of Orion Nebula
[1] [13] However, more recent models of its stellar evolution have suggested revision of the star's age to 13.7 billion years [14] or 12 billion years. [ 5 ] Dubbed the " Methuselah Star" by the popular press due to its age, [ 15 ] [ 16 ] the star must have formed soon after the Big Bang [ 1 ] and is one of the oldest stars known as of 2021. [ 5 ]
The Day of Five Billion, 11 July 1987, was designated by the United Nations Population Fund as the approximate day on which the world population reached five billion. Matej Gašpar from Zagreb , Croatia (then SR Croatia , SFR Yugoslavia ), was chosen as the symbolic 5-billionth person alive on Earth .
1939 – April – Nazi Germany begins the German nuclear energy project. 1939 – September 1 – World War II begins after the invasion and subsequent partition of Poland between Nazi Germany and the Soviet Union.
After the end of the war, between 13.5 and 16.5 million German-speakers lost their homes in formerly German lands and all over Eastern Europe. Origin of German colonisers settled in annexed Polish territories in action " Heim ins Reich " Expulsion of Poles from Reichsgau Wartheland following the German invasion of 1939 Germans leaving Silesia ...
The V2 (German: Vergeltungswaffe 2, lit. 'Vengeance Weapon 2'), with the technical name Aggregat 4 (A4), was the world's first long-range [4] guided ballistic missile.The missile, powered by a liquid-propellant rocket engine, was developed during the Second World War in Nazi Germany as a "vengeance weapon" and assigned to attack Allied cities as retaliation for the Allied bombings of German ...
The Continuation War, [f] also known as the Second Soviet-Finnish War, was a conflict fought by Finland and Nazi Germany against the Soviet Union during World War II.It began with a Finnish declaration of war on 25 June 1941 and ended on 19 September 1944 with the Moscow Armistice.