As the ESA Rosetta probe approached it's target, Comet 67P (67P/Churyumov–Gerasimenko), I was having a tough time grasping the scale of this object.
In response to @ObservingSpace tweeting a picture of 67P, I suggested comparing it to major cities.
I knew there were others far more talented than me, but I decided to put something together. I grabbed some images of 67P from the ESA, an older one with a 2km scale and the latest one without, and, in PowerPoint, adjusted the images to match so that I would have a scale on the latest image.
I then went to Google Maps and took a screenshot of a map of Manhattan with a 500m scale. Adjusting the scales to match, I had 67P superimposed on Central Park.
I tweeted this including ESA and Emily Lakdawalla and also Phil Plait, with little response.
Turning my sites to Europe, since the mission is through the ESA, I thought of another big rock, Gibraltar, this time using Google Earth:
But then I hit upon an idea that strangely was more useful than reality: Star Trek.
I remembered being fascinated by a website called Jeff Russell's STARSHIP DIMENSIONS at http://www.merzo.net/ where spacecraft from Sci Fi were drawn to scale.
I sized several Star Trek stations and ships and came up with this:
I have since made a few more comparisons and realized that a black background looks better.
Here's the latest gallery: