Why does the night sky look a bit different after 100 years?

Question

I am using Heavens Above interactive Skychart and noticed that if you move the year by 100 year increments, the night sky changes, but not so much. What causes this?

In: Planetary Science

Answer 1

The closest stars to us (Like Proxima Centuri) would show some slight movement over 100 years. It all depends on how close they are and how they are moving relative to our solar system.