If a galaxy were to strike our galaxy, then would we die?

Galaxies are held together by mutual gravity and orbit around a common center. Interactions between galaxies is quite common, especially between giant and satellite galaxies. read more

The galaxies we see in the night sky have been around for billions of years and remain unchanged for millions of years. However they do evolve and they can also be disrupted by the gravity from other galaxies. read more

Most of the 54 galaxies in our Local Group are more close to Andromeda's age of 10 billion years than our own Milky Way's ancient 13.2 billion years. Most are dwarf galaxies or small globular clusters. read more

What we will notice from the several stars we are on is that star orbits around the galactic centre will be altered by the massive gravitational perturbation made by the other galaxy. Almost all stars will change orbits from that of orbiting around the galactic centre to orbiting around the center of mass of both galaxies. read more