Asteroid Day is a chance to learn about space and plan for disaster
![asteroid 1999 JD6](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2016/06/062916_asteriod-day_free.gif?fit=860%2C460&ssl=1)
Radar mapping revealed two lobes of a 2-kilometer-long asteroid (designated 1999 JD6) when it buzzed Earth on July 25, 2015. Asteroid Day on June 30 raises awareness of run-ins with such rocks.
JPL-Caltech/NASA, NRAO