NASA is using its most powerful space telescope to study the true size of the "city-killer" asteroid that has a one-in-43 ...

Scientists simulated what would happen if a medium-size asteroid were to strike Earth. One of those space rocks, asteroid ...

Mass is a challenging concept to tie down, yet it is one of the most crucial measurements in our world. Since the 1800's, we've used a physical artifact as a standard for mass calibration across the ...