Researchers have used the Hubble Space Telescope's WFC3/G141 camera to study brightness changes in three early L-dwarfs, a class of brown dwarfs that sit between planets and stars. This preprint (not yet peer-reviewed) from arXiv (https://arxiv.org/abs/2603.24663) monitored the objects 2MASS J1721039+334415, 2MASS J00361617+1821104, and 2MASS J19064801+4011089 in near-infrared light between 1.1 and 1.67 microns, finding variability amplitudes of 0.53–1.41% in white light. The team built flexible models to test three possible causes—inhomogeneous clouds, aurorae, and magnetic spots—and concluded that changing cloud properties or magnetic spots best explain the data, while auroral effects do not fit well in these wavelengths. With a sample size of only three objects, the study notes long-term light curve stability suggesting persistent surface features and reports a new 4.9-hour rotation period for one dwarf; limitations include the narrow wavelength range and small sample, with the authors recommending longer-wavelength observations to better probe aurorae.