Meteor explosions like this year’s Russian fireball more common than thought
Chelyabinsk-sized rocks may come to Earth every 30 years, on average
![](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2013/11/ag_popova4HR_feat_free.jpg?fit=860%2C460&ssl=1)
SPACE ROCKS This 570-kilogram meteorite was recovered from Lake Chebarkul on October 16.
Courtesy of Science/AAAS