After Nasa's New Horizons spacecraft made a successful fly-past of Pluto, the space agency learned a staggering amount about the dwarf planet which orbits on the edge of our solar system.
This gif showed just how quickly our knowledge of Pluto has increased:
The $720 million (£461 million) probe is the size of a baby grand piano and, after launching on January 19 2006, it reached an Earth-relative velocity of 36,373mph, making it the fastest space vehicle in history.
The programme only cost $0.15 dollars per American per year - which is an incredibly small outlay for a mission that was so successful.
The craft sent images back to Nasa from nearly three billion miles away after it passed within 7,700 miles of Pluto, and here’s what we have learned since:
We’ve seen Pluto’s heart
Heart-shaped feature that is. It’s approximately 1,000 miles (1,600 kilometers) across, and new images have shown how gorgeous it is.
The 'heart' borders darker equatorial terrains, and the mottled terrain to its east is complex.
New close-up images of a region near Pluto’s equator revealed a giant surprise: a range of youthful mountains rising as high as 11,000 feet (3,500 meters) above the surface of the dwarf planet.
The mountains on Pluto likely formed no more than 100 million years ago. In comparison, the solar system is 4.56 billion years old.
This suggests the close-up region, which covers about one percent of Pluto’s surface, may still be geologically active today.