2 May – Scientists discover that Helium is present in the exoplanet WASP-107b.[145] 5 May – The InSight spacecraft, designed to study the interior and subsurface of the planet Mars, successfully launches at 11:05 UTC, with an expected arrival on 26 November 2018.[146][147] 9 May – Scientists report that the curious physical phenomenon of quantum entanglement is even more supported based on recent rigorous Bell test experimentations.[148][149] 10 May – NASA's Carbon Monitoring System (CMS) is cancelled by the Trump administration.[150] 11 May – NASA approves the Mars Helicopter Scout (MHS) program that is expected to add a helicopter to the Mars 2020 rover mission.[142][143][144] 14 May Astronomers publish supporting evidence of water plume activity on Europa, moon of the planet Jupiter, based on an updated critical analysis of data obtained from the Galileo space probe, which orbited Jupiter between 1995 to 2003.