By Ron Cowen
Ya got trouble, my friend. Trouble with a capital T and that rhymes with G and that stands for gravity.
![](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2008/03/7531.jpg?resize=150%2C116&ssl=1)
A new analysis suggests that when five different spacecraft flew past Earth several years ago, they gained more speed than can be accounted for by Einstein’s theory of gravitation.