This is not a proper art submitting, just something I wanted to share with all.
I found the source of the previous uploaded picture. I included the names of the artists and their homepage. This one has most of the measures of the Sci-fi starships shown on the last size comparison chart.
It includes some Star Trek, Star Wars, Robotech/Macross ships. The Death Star is about 100 miles in diameter, it would be too damn large for showing it here.
If this post infringes any copyright law, I will delete it.
All ship diagrams and related names shown here are registered trademarks of their respective owners.
Second chart here: [link]
Third chart here: [link]
Download size: 2000 x 1400