You can see a giant 'hole' shoot across Saturn this summer — and it won't happen again until 2040

You can see a giant 'hole' shoot across Saturn this summer — and it won't happen again until 2040

There will be several chances to see the shadow of Saturn's largest moon, Titan, pass across the ringed planet's Earth-facing surface over the next few months. The rare spectacle is only visible every 15 years.