Rare black moon will grace our sky tonight

Tonight’s new moon—the second new moon in a month—is going to be what scientists call a black moon. These rare moon types are similar to blue moons—which occur when two full moons happen in one calendar month. Black moons, though, can occur in a few different instances.

Unlike the blue moon, which doesn’t actually appear blue at all, these rare moons are exactly what it sounds like. That’s because new moons are already almost invisible in the night sky. This makes it a great time to go stargazing...