 But their return trip has been put on hold while the thruster trouble and helium leaks are analyzed. On Friday, NASA said there is no rush to bring the astronauts home and more tests on the ground would be done first. Ron Taylor reporting. Stocks were lower on Wall Street Friday. Benchmark U.S. crude oil for August delivery fell by 20 cents a barrel to $81 and 54 cents. Brent crude for August delivery rose by 2 cents. More from townhome.com.