 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 drifted lower on Wall Street, erasing the S&P 500's gains for the week. The S&P 500 slipped by 0.4% on Friday. This is SRN News.