The smallest amount of material from a black hole or neutron star that can be captured by a human is an intriguing concept to consider. However, it is important to note that both black holes and neutron stars are extremely dense and possess immense gravitational forces, making direct interaction with them highly dangerous, if not impossible, for humans.
Black Holes: Black holes are formed from the gravitational collapse of massive stars, and their gravitational pull is so intense that nothing, including light, can escape their event horizon. Due to their compact nature, capturing even the smallest amount of black hole material is impractical. Moreover, approaching a black hole's event horizon would expose an individual to extreme tidal forces and intense radiation, which would be lethal.
Neutron Stars: Neutron stars are incredibly dense remnants of massive stars that have undergone supernova explosions. They contain matter packed so tightly that a teaspoon of neutron star material would weigh billions of tons on Earth. Getting close to a neutron star would expose a human to intense gravitational forces and extreme radiation, making direct capture of material unfeasible.
In both cases, the extreme physical properties and associated hazards prevent direct capture of black hole or neutron star material by humans. Instead, scientists study these objects indirectly through astrophysical observations, such as analyzing electromagnetic radiation emitted by them or observing their effects on surrounding matter.
It's worth noting that theoretical studies are continuously advancing our understanding of these exotic objects. However, for the safety of humans, it is not feasible or advisable to attempt to capture material from black holes or neutron stars directly.