29K views · 1.2K reactions | When was the last time an asteroid hit Earth? Small asteroids and other tiny particles bombard our planet daily, but almost all of them burn up safely in the atmosphere. Bigger impacts are extremely rare, but scientists like Marina Brozovic are keeping their eyes on the sky. Explore more: https://www.nasa.gov/planetarydefense | NASA - National Aeronautics and Space Administration | Facebook

54K views · 1K reactions | We’ve got your back, Earth. NASA enters its third decade of planetary defense. See how we track and study asteroids: https://go.nasa.gov/2NDCru1 | NASA Jet Propulsion Laboratory | Facebook