Nasa's New Horizons spacecraft flew by the 35km-long ... "This is an accretionary environment - this satellite is accreting particles. Those particles just happen to be small," he explained.

We know about Pluto. But we don’t really know it. That will change on July 14, when NASA’s New Horizons spacecraft is scheduled to fly within 8,000 miles of the frozen dwarf. It’s a risky ...