<< When a rocket is launched into space, it is thrown out with a speed of 11 km/s to overcome the Earth's gravitational pull [..] Our home galaxy, the Milky Way, is over a trillion times heavier than our tiny planet Earth so to escape its gravitational pull we have to launch with a speed of 550 km/s. >> Prajwal Kafle.
International Centre for Radio Astronomy Research. Milky Way ties with neighbor in galactic arms race. Feb 14, 2018.
intrigante il video che simula la collisione- fusione