Near Earth asteroids, artwork. Diagram showing an edge-on view of our solar system, with dots representing a snapshot of the population of near-earth asteroids (NEAs) and potentially hazardous asteroids (PHAs) that scientists think are likely to exist based on the results of NASA's NEOWISE (Near-Earth Object WISE) survey. Positions of a simulated population of PHAs on a typical day are shown in bright orange, and the simulated NEAs are blue. Earth's orbit is green.