Saturn's giant moon Titan keeps revealing mysterious dynamics in the here and now, leaving interpretation to fallible scientists who sometimes predicted otherwise.
Globular clusters supposedly all formed at the same time long ago, but some look young. How do astronomers rescue the belief that they are ancient groupings of stars?
Apollo ended 50 years ago, Neil Armstrong is dead, but lunar geologists are still using the moon rocks they brought home to construct a story of the moon's "evolution".