Live coverage: International Space Station crew lands in Kazakhstan

Marc Buie, Occultation Team Lead, reveals what we know so far about the shape of Ultima Thule as New Horizons races towards its encounter with the Kuiper Belt object.

Nearly seven months aboard the International Space Station may be an extreme case of social distancing and isolation, but astronaut Jessica Meir says she expects to feel more isolated than ever when she returns next week to a planet in the grip of the coronavirus.

Astronauts Peggy Whitson and Jack Fischer put on spacesuits Friday and headed outside the International Space Station for several repair and maintenance tasks, but the duo only completed part of their originally planned work after a leaky cooling umbilical delayed the start of their spacewalk.