We're all going to die one day, much like these two merging galaxies

Everything in the universe comes with an expiration date.  Our planet, for example, will likely be swallowed by the sun in 7 or 8 billion years, when it begins to run out of fuel, heading toward its own death. Milk, on the other hand, spoils after a couple of weeks. And of course, even some of the largest structures in our universe, galaxies, will also die ... some in a far more dramatic fashion than others.  SEE ALSO: 2 galaxies merge as 1 in remarkable Hubble Telescope photo Two gala