Astronomers have detected barium around the ultra-hot gas giants WASP-76 b and WASP-121 b. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works.

Figure 1: Basic host–guest motif of the Ba-IV crystal structures. Figure 2: Single-crystal X-ray diffraction data of Ba-IVc at 19 GPa. As we will see below, the crystal structure lacks translational ...