Gamma rays, the most energetic form of light, reveal extreme conditions in the Universe. The
Fermi Gamma-ray Space Telescope has been exploring the gamma-ray sky for over 14 years,
enabling a search for powerful transients like gamma-ray bursts, novae, solar flares, and flaring
active galactic nuclei, as well as long-term studies including pulsars, binary systems, supernova
remnants, and searches for predicted sources of gamma rays such as dark matter annihilation.
Some results include a stringent limit on Lorentz invariance derived from a gamma-ray burst,
unexpected gamma-ray variability from the Crab Nebula, a huge gamma-ray structure associated
with the center of our galaxy, surprising detections of gamma rays from novae, a gamma-ray burst
from merging neutron stars, and a possible constraint on someWeakly Interacting Massive Particle
(WIMP) models for dark matter. The Fermi instruments continue to monitor the gamma-ray sky
and are expected to be important contributors to multiwavelength and multimessenger astrophysics
in coming years.