It's our Sky Guys: the hunt for 'planet nine' continues, with evidence of a huge, but unseen mass beyond Pluto. The mars rover Opportunity celebrates its twelfth birthday, exploring the red planet long beyond expectations.  And this week, it's your best chance to see Mercury, Venus, Saturn, Mars, and Jupiter lined up across the early morning sky.

Emily Corwin / NHPR

When celebrated Concord resident and high school teacher Christa McAuliffe died in the Challenger explosion in 1986, an out-of– state donor offered $500,000 to build a monument in downtown Concord. As then-mayor Jim MacKay remembers, the city declined. Instead, the state built a planetarium. Today – 26 years after the state opened the McAuliffe Planetarium — the facility is on its way to becoming a private, nonprofit institution.