My favorite part of astronomy class is the tidbits like "in 12,000 years, Vega will replace Polaris as the North Star" and "in 600 million years, Earth will see its last total solar eclipse as the moon drifts away"

I love these reminders that what we see as the fixed cosmic status quo is anything but on a bigger scale, and the grandeur of thinking about unimaginably distant descendants having a totally different default sky