Black hole app lets you blow up stars
iPad game teaches about gravity, astronomy
![Black Hole app](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2016/09/091716_reviews_main.jpg?fit=860%2C460&ssl=1)
AIM FOR THE STARS The objective of a new iPad game is to collide celestial objects together to grow a star so large that it collapses to form a black hole.
Tyler Howe/WGBH Educational Foundation