Gaia Sky lets you explore our galaxy, the Milky Way. Gaia Sky is a real-time, 3D, astronomy visualisation software that runs on Windows, Linux and macOS.
https://zah.uni-heidelberg.de/institutes/ari/gaia/outreach/gaiasky/
The Empire State Building brings to mind that iconic image of King Kong atop the skyscraper, swatting away biplanes as he clutches Fay Wray in his massive hand. But how massive? How big would the 1933 movie version of Kong have been, and how much would he have weighed … ?
http://www.andrewcaelliott.com/explorations/2016/10/27/how-much-did-king-kong-weigh
Is That a Big Number is now a book, published by Oxford University Press. (Google ISBN 0198821220 to find many online booksellers). Although there is serious purpose behind the book - to explore how we think about numbers and how we can understand big numbers - it’s written in a light and engaging style.
Entertaining, full of practical examples, and memorable concepts, Is That A Big Number? renews our relationship with numeracy. If numbers are the musical notes with which the symphony of the universe is written, and you’re struggling to hear the tune, then this is the book to get you humming again.