On the cover

Two narrow jets of plasma erupt from a newborn star found in the constellation Orion in this Hubble Space Telescope image. The jets together are 10¹³ m long and may form when matter in the star’s accretion disk interacts with the strong stellar magnetic field. One approach to studying the essential physics of the jets is for researchers to create millimeter-sized versions in the lab. The making of energetic, magnetized plasmas in the lab is discussed in the article by Jack Hare. (Image from NASA, ESA, Hubble Heritage/Hubble-Europe Collaboration, D. Padgett, T. Megeath, and B. Reipurth.)