In the March 4 SN: Search for sustainable catalysts, deflating cancer’s defenses, species miscounts, frog spit secrets, an acrobatic bat robot, coconut-cracking crabs, baffling X-ray bump, neutron’s elusive lifetime, Zika’s baby photo and more.
PLANETARY LINEUP Seven Earth-sized planets orbit the star TRAPPIST-1 with short periods, from 1.5 to 20 Earth days. This artist’s illustration shows potential differences in the planets’ surfaces and sizes.
HEY NEIGHBOR Proxima b, depicted with its star in this illustration, is at least 1.3 times as massive as Earth — but that is just a minimum estimate.
L. Calçada, Nick Risinger (skysurvey.org)/ESO
A WORLD NEXT DOOR Proxima Centauri casts a reddish glow over the surface of Proxima b (illustrated), the closest exoplanet to Earth, while two companion stars, Alpha Centauri A and B, appear as bright pinpricks of light.