- GLAST will be able to detect gamma rays produced by the annihilation or decay of dark matter particles.

- This will provide information about the mass, lifetime, and distribution of dark matter, which are all important clues to its nature.

2. The origin of the highest-energy cosmic rays.

- Cosmic rays are charged particles that travel through space at very high energies.

- The highest-energy cosmic rays are thought to be produced by powerful astrophysical sources, such as supernovae or active galactic nuclei.

- GLAST will be able to identify the sources of these high-energy cosmic rays and study their properties.

3. The acceleration mechanisms in jets from Active Galactic Nuclei (AGN).

- GLAST will measure the spectra and variability of AGN jets at very high energies, providing information about particle acceleration and jet physics.

- The emission mechanism will be probed in unprecedented energy detail, helping to unravel the mystery of the central engines of AGN.

4. The physics of pulsar wind nebulae.

- GLAST will image the gamma-ray emission of pulsars, providing detailed insights into the acceleration of particles and the magnetic field geometries of these systems.

- Such studies will help to advance our understanding of pulsar magnetospheres and their role in the energetics of young neutron stars.

5. The population and properties of gamma-ray bursts (GRBs).

- GRBs are brief, intense bursts of gamma radiation that are thought to be produced by the collapse of massive stars.

- GLAST will detect and study a large number of GRBs, which will provide information about their progenitors, their environments, and their contribution to the overall gamma-ray background.

6. The existence of very high-energy photons from cosmic accelerators, blazars, and other sources undergoing very high-energy interactions.

- The search for photons above 100 TeV will constrain models of the acceleration and absorption processes taking place in the intergalactic as well as the intergalactic medium.

- Such sources will complement UHECR astronomy studies at the highest energies.

7. Gamma-ray counterparts to detected gravitational wave events.

- GLAST will monitor the sky for coincident emission in association with gravitational wave signals detected by LIGO and VIRGO, contributing to the multimessenger physics of compact object mergers.