A SpaceX capsule with four astronauts on board has undocked from the International Space Station (ISS) and was on its way back to Earth following delays due to adverse weather conditions, US space agency NASA said on Wednesday. The SpaceX Dragon spacecraft, carrying NASA astronauts Matt Dominick, Mike Barratt and Jeanette Epps along with Roscosmos cosmonaut Alexander Grebenkin, undocked at 2105 GMT and was due to splash down off the coast of Florida at around 3:30 am on Friday (0730 GMT). The crew has been on board the space outpost since March. They were originally scheduled to return to Eart…