The universe began with the Big Bang billions of years ago, and now astronomers say we’ll be dealing with another big bang — in about four billion years or so.
The coming big bang will occur when our galaxy, the Milky Way, collides with and merges into Andromeda, a neighboring galaxy. The two galaxies are being pulled together by their mutual gravities, and in fact are rushing toward each other at the breathtaking speed of 250,000 miles per hour. At such astronomical (pun intended) speeds, it’s hard to believe that all Earth-dwellers aren’t experiencing a touch of cosmic motion sickness.
Of course, galaxies are mostly empty space, so whoever is left on Earth when the galactic convergence occurs isn’t likely to see suns and planets smashing into each other. But the night sky will look different. Orion and Taurus and Ursa Major will have lots of company.