New Horizons took this detailed image of a space object called 2014 MU69 (or "Ultima Thule") at 12:26 a.m. EST on January 1, 2019.

  • NASA's New Horizons probe flew by a space rock called 2014 MU69, the most distant space object ever visited by humanity, on New Year's Day.
  • Also called Ultima Thule, the rock is more than 4 billion miles away.
  • The newest image sequence of Ultima Thule has reveals that the rock is not spherical, as scientists previously thought, but rather flat.
  • New Horizons captured hundreds of photos of the object, but it will take the probe up to 20 months to beam back all that data.

The most distant object our species has ever visited, a space rock called 2014 MU69, is less snowman-shaped than scientists previously thought.

NASA flew its New Horizons probe by the rock, which is nicknamed Ultima Thule and located 6.4 billion km from Earth, on New Year's Day.

New Horizons flew within 3,500km of MU69, traveling at a speed of 51,000km per hour. The flyby gave scientists the opportunity to collect photos and information about the rock that they hope will help solve some longstanding mysteries about the solar system's 4.5 billion years of history.

The first image the probe beamed back showed two reddish-colored spherical segments on top of each other, like a snowman. Subsequent data revealed that the object flips like a giant hourglass. But it will take about 20 months for New Horizons to send all of the images it captured back to Earth, and scientists' understanding of the rock is changing as fresh perspectives get revealed.

The newest sequence of images suggests that instead of two spheres, MU69's sections (called "lobes") are somewhat flat. The shape is relatively unprecedented in scientific observations of the solar system.

"We've never seen something like this orbiting the sun," Alan Stern, principal investigator on the New Horizons mission, said in a press release.

Based on the new images, the larger lobe (nicknamed Ultima) appears to more closely resemble a giant pancake. The smaller lobe (Thule) is akin to a dented walnut, NASA's New Horizons team reported.

Previously, scientists thought Ultima Thule was more snowman shaped. Now, new fly-by images reveal it had a flatter profile.

"We had an impression of Ultima Thule based on the limited number of images returned in the days around the flyby, but seeing more data has significantly changed our view," Stern said. "It would be closer to reality to say Ultima Thule's shape is flatter, like a pancake. But more importantly, the new images are creating scientific puzzles about how such an object could even be formed."

NASA scientists shared the 3D animation of the space rock's shape below, which was created using images that New Horizons captured as it left MU69 behind. The photos were taken nearly 10 minutes after the probe passed its closest point to the rock.

While these are far from the final photos of Ultima Thule that New Horizons will send back, they do represent the spacecraft's last glimpses of the rock as it streaked away.

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