https://www.physicsforums.com/threads/the-best-book-to-start-with-string-theory.446991/ B. Zwiebach, A First Course in String Theory
The Black Vault is the largest privately run archive of declassified documents in the world. https://www.theblackvault.com/
https://www.space.com/how-can-a-star-be-older-than-the-universe.html?fbclid=IwAR0-aS359zCzdHF3GbjKIvqO9RsoDRvUo7IQ9JBQhsoVWsbxwHVC_seN_fo How Can a Star Be Older Than the Universe?
Azimuth and Elevation are measures used to identify the position of a satellite flying overhead. Azimuth tells you what direction to face and Elevation tells you how high up in the sky to look. Both are measured in degrees. Azimuth varies from 0° to 360°. It starts with North at 0°. As you turn to… Leer más »
https://beyondnerva.com/nuclear-thermal-propulsion/ Unlike most things at Beyond NERVA, the nuclear thermal rocket (NTR) has been built and tested by both the US and the USSR. Both programs looked at a solid core NTR, the simplest type of nuclear rocket. In a nuclear thermal rocket, the heat from a reactor is used to directly heat a propellant,… Leer más »
That is what antimatter can do. Annihilating a kilogram of antimatter will give out about ten billion times the amount of energy released when a kilogram of TNT explodes. Under suitable circumstances a proton can change into a neutron and emit energy some of which materializes as a positron, similar to what happens in the… Leer más »
https://en.wikipedia.org/wiki/Tunguska_event The Tunguska event was a large explosion that occurred near the Podkamennaya Tunguska River in Yeniseysk Governorate (now Krasnoyarsk Krai), Russia, on the morning of 30 June 1908 (NS). The explosion over the sparsely populated Eastern Siberian Taiga flattened 2,000 square kilometres (770 square miles) of forest, yet caused no known human casualties. The explosion is generally attributed to the air burst of a meteor. It is classified as an impact… Leer más »