Lightbulbs and astronomical numbers

When the ceiling is 3 floors up it's not so easy to change a light bulb. To be honest this workman was removing two lamps, but I remember when I worked in this library that every few years they would bring in a cherry-picker and change all the bulbs in one go.
I was in the library to listen to a lecture entitled "Red Giants, White Dwarfs, and Black Holes." I've always been interested in astronomy and the Universe so I knew the basics but I learned a bit more about the final stage for a star which, depending on size, ends its life as a white dwarf, a neutron star, or a black hole.
The extra shows the images of the two black holes astronomers have "photographed". What impressed me was the size of these black holes, especially M87. It's the black hole at the centre of the galaxy of the same name. It has a diameter around 10 times larger than the solar system and containing many billion solar masses. Sagittarius A*, at the centre of our galaxy, is much smaller but still contains well over 4 million solar masses. Big numbers!
In the evening we were back in town to meet our local Left Party MP. A lot of interesting discussion, at times a bit frustrating.
Our planet is maybe going to get thoroughly roasted 5 billion years from now, but how about more equitable distribution of wealth in the meantime?