At 2.5 million light years distance, it may sound like a bit of a joke to most of us, but astro-imaging of the Andromeda galaxy (M-31) in terms of resolution and image scale size will continue to improve on the very smallest imaginable scale as it approaches the Milky Way at a rate of approximately 250,000 miles per hour (6,000,000 miles/day) over the next 4 billion years. Not that we should all hold our breath when the Andromeda galaxy finally merges with the Milky Way or that we should leave that day blank on our calendars...but never-the-less it will happen...and it's a pretty good bet that it will happen long after life on this planet has long since disappeared for good....So what will the merger between M-31 and our Milky Way galaxy look like in approximately 3.75 billions years? See the attached Wikimedia Commons Public Domain illustration by www.nasa.gov. for a better impression of the size and scale of this extremely distant...much anticipated future cosmic event.
But wouldn't it great to be still around 3.75 billion years from now to actually witness this naked-eye spectacular cosmic merger between two large splendid galaxies. The actual cosmic galactic merger show itself as pictured here in the photo will probably be much the same as going to your 100 year high school reunion...No one is going to be around to enjoy it.
Edited by Klitwo, 27 February 2016 - 04:15 AM.