Big Black Glasses

Are you glad someone is watching for PHAs?

NASA image shows
differences between orbits of 
  typical near-Earth asteroid  (blue) 
       and
  potentially hazardous asteroid, or PHA  (orange).

• PHAs are subset of near-Earth asteroids (NEAs)
• Have closest orbits to Earth’s orbit (green), within 5 million miles
• Large enough to survive passage through Earth’s atmosphere 
• Could cause damage on a regional, or greater, scale

Image Credit: NASA/JPL-Caltech

Can you say “Thank you, NASA?”