Astronomy: The [Relative] Size of [Some] Stuff

[Winston]

https://astronomycentral.co.uk/astronomy-the-size-of-stuff/

One example found there, North America on Mars:

 

[ThirstyBarbarian]

That is a very cool link. Some of these things are smaller than you would guess, and many are larger. So it's nice to see a comparison.

 

[Kirk G]

That's great. I would have thought Mars smaller than that... but now I can see why it's a worthy target for space exploration!

I'd like to see a comparison of Olympic Mons (the largest shield volcano in the known planetary system and on Mars) and our own Hawaii islands. I understand Hawaii rises 13 miles from the ocean floor to break the ocean's surface and climb to 15,000 feet or so. So, a side by side comparison of what we see above the waterline and what's above the ocean floor would be of great interest!