  Collisionless shock waves, ubiquitous in the universe, are crucial for
particle acceleration in various astrophysical systems. Currently, the
heliosphere is the only natural environment available for their in situ study.
In this work, we showcase the collective acceleration of electrons and ions by
one of the fastest in situ shocks ever recorded, observed by the pioneering
Parker Solar Probe at only 34.5 million kilometers from the Sun. Our analysis
of this unprecedented, near-parallel shock shows electron acceleration up to 6
MeV amidst intense multi-scale electromagnetic wave emissions. We also present
evidence of a variable shock structure capable of injecting and accelerating
ions from the solar wind to high energies through a self-consistent process.
The exceptional capability of the probe's instruments to measure
electromagnetic fields in a shock traveling at 1% the speed of light has
enabled us, for the first time, to confirm that the structure of a strong
heliospheric shock aligns with theoretical models of strong shocks observed in
astrophysical environments. This alignment offers viable avenues for
understanding astrophysical shock processes and the acceleration of charged
particles.
