An American and a German astronaut spent just over six hours on a spacewalk outside the International Space Station for equipment repairs and maintenance.
Twitter sued the US government, claiming its free speech rights are being violated by restrictions on its ability to disclose numbers of secret orders.
Barack Obama said the chances of a US Ebola outbreak were "extraordinarily low" but vowed to press world leaders to step up the global fight against the epidemic.
US health officials said that a doctor who returned to a hospital after being treated for the Ebola virus did not have a new case of the infectious disease.