Our rockets limit the number of ore-bearing asteroids. In the graph above, asteroid 101955 Bennu, a carbonaceous asteroid, has a Delta-V of 5.087 km/s, according to the Jet Propulsion Laboratory (JPL) (source). On 8 September 2016, NASA has launched The OSIRIS-REx (Origins, Spectral Interpretation, Resource Identification, Security, Regolith Explorer) asteroid study and sample-return mission, to study asteroid 101955 Bennu, and return a sample to Earth on 24 September 2023 for detailed analysis. While travelling to its destination, OSIRIX-REx took two amazing photos of Earth and Moon. First, 3 million miles (5 million kilometers) and then, 39.5 million miles (63.6 million kilometers) from Earth.