What do you know about the following?
Radiation Relativity Quantum mechanics
The vastness of the universe
Few people realize how much our picture of the universe has changed in 100 years. At the end of the 19th century, the universe was thought to contain only hundreds of thousands of stars arranged in no particularly interesting patterns. The most distance stars were thought to be about 100,000 light years away (meaning that it would take light 100,000 years to travel from Earth to such distant stars; 1 light-year is about 10 trillion kilometres or 6 trillion miles). Today, astronomers have observed objects that are about 10,000,000,000 [= ten billion] light years away. Furthermore, they have discovered that the universe contains many interesting structures. Amazingly, it was not until the 1920's that it was realized that galaxies exist. Galaxies are vast collections of stars grouped together in a relatively localized region of the universe. A typical galaxy contains 100,000,000,000 [=one hundred billion] stars and is 100,000 light years in size.
Some important physicists
What do you know about the following scientists?
Neils Bohr Werner Heisenberg Erwin Schrodinger Frederic Joliot-Curie
Enrico Fermi H.G. Wells Leo Szilard Vannevar Bush
National Socialism and the scientists – two sides to every story
At the peak of atomic and nuclear physics, there was a rise in National Socialism. The Nazis drove out many German scientists, including Albert Einstein, Otto Hahn, Lise Meitner, and Fritz Strassmann due to “anti-intellectualism” according to McGee. This led to certain German and Jewish intellectuals fleeing into the arms of German enemies, bringing nuclear research to other countries such as the United States. Ultimately, these escaped researchers contributed to the development and research of atomic ware fare under the code name—the Manhattan Project.
1915 – relativity 1916 – wormhole 1917 – cosmological constant
1919 – proton discovered 1922 – primeval soup 1925- size of universe contended
1926- uncertainty principle 1927- universe is expanding 1928-antimatter exists
1929 – galaxies moving away 1932 – electrons / splitting the atom1934 – dark matter 1939 – nuclear fission