If you’ve read Forever His, you know that a lunar eclipse plays a major role in the story. Tonight, you can see a real-life lunar eclipse! Thiscelestial event isjust the first in what NASA calls “an extraordinary series of total lunar eclipses” that will take place over the next two years. Watch this cool NASA video to see how they happen.

Unlike a solar eclipse, which istypically only visible for a few minutes, a lunar eclipse canusually be seen for several hours. And it’s safe to observe a l...