What do we know about Ultima Thule?

Ultima Thule (ultima thoo-lee) — or 2014 MU69 as it is officially known — was discovered in 2014.
"Ultima is quite mysterious. We don't know much about its size and shape," Dr Stern said.
What we know so far is from its silhouette captured by telescopes such as the Hubble Space Telescope as the icy object passed in front of stars. 
"From that we determine it's about 30 kilometres long, and it's shaped a little bit like a figure eight," Dr Stern said.
This suggests Ultima Thule could be two objects connected together, what's known as a contact binary, or two objects orbiting each other.

"We've been taking images of Ultima Thule ever since August from onboard the spacecraft, but it's just a dot in the distance that grows brighter and brighter and brighter."

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