Photos: Delta 4-Heavy launch gallery

The final days before NASA’s New Horizons probe barrels in on its next destination on Jan. 1, 2019, should prove eventful, with scientists trying to sort out whether a distant mini-world detected by the Hubble Space Telescope more than three years ago may actually be a swarm of icy objects.

As NASA’s New Horizons probe closes in on Pluto, the Hubble Space telescope has been scouting its retinue of five known moons, discovering that at least two are tumbling chaotically in the complex gravity of the dwarf planet and its large moon, Charon, researchers said Wednesday.

A U.S. Navy transport ship carrying NASA’s first space-worthy Orion capsule arrived Monday in San Diego, where ground crews will offload the spacecraft for shipment back to its home port at the Kennedy Space Center in Florida.