ESA scientists have been exploring how a future moon base might be built from materials on the lunar surface. Inspired by LEGO building, they have used dust from a meteorite to 3D-print "space bricks" to test the idea. ESA's space bricks are on display in selected LEGO Stores from 20 June to 20 September, helping to inspire the next generation of space engineers.

The idea seems simple. Rather than take building materials all the way to the moon, we could use what is already there to construct a moon base. The surface of the moon is covered with a layer of rock and mineral fragments known as lunar regolith.

When two veteran NASA astronauts blasted off on a test drive of Boeing's new capsule, they expected to head home from the International Space Station in a week or so.

It's now three weeks and counting for Butch Wilmore and Suni Williams as NASA and Boeing troubleshoot equipment problems that popped up on the way there.

Three potential landing dates were called off and their flight home is now on hold.

This week, Boeing said the Starliner capsule's problems aren't a concern for the return trip and "the astronauts are not stranded.