02/12/2021

Some polycrystal grain boundaries feel the heat more than others

Polycrystals are solid materials that are made up of lots of small crystals. The points where the crystals meet are known as grain boundaries (GBs). GBs are important because they can affect the way the solid behaves. However, ...

Test tanks fuelled for ESA's Themis reusable first stage

Recently completed tests of two propellant tanks set a first technological milestone in the ESA reusability roadmap towards the demonstration of a reusable first stage vehicle called Themis.

Two versions of a Curiosity selfie: narrow and wide

NASA's Curiosity Mars rover took this 360-degree selfie using the Mars Hand Lens Imager, or MAHLI, at the end of its robotic arm. The selfie comprises 81 individual images taken on Nov. 20, 2021—the 3,303rd Martian day, or ...

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