Periodic Reporting for period 3 - JetNS (Relativistic Jets in Astrophysics -Compact binary mergers, Gamma-Ray Bursts, and Beyond)

What is the origin of the heavy element (such as gold) we find on Earth? What is the source of the light that follows gravitational waves observed from mergers of two neutron stars? How well binary neutron star mergers can be used to measure the expansion rate of the Universe...