2 October Arthur Ashkin from the United States, Gérard Mourou from France and Donna Strickland from Canada win the Nobel Prize in Physics "for groundbreaking inventions in the field of laser physics".[327] Astronomers using data from the Gaia mission report the discovery of rogue, high-velocity stars hurtling towards the Milky Way, possibly originating from another galaxy.[328] 3 October Frances H. Arnold from the United States, George P. Smith from the United States and Gregory P. Winter from the United Kingdom win the Nobel Prize in Chemistry for their work in evolutionary science.[329] Astronomers publish details of a candidate exomoon, Kepler-1625b I, suggesting it has a mass and radius similar to Neptune, and orbits the exoplanet Kepler-1625b.[325][326][330][331] 4 October – Researchers at McMaster University announce the development of a new technology, called a Planet Simulator, to help study the origin of life on planet Earth and beyond.[332][333][334][335] 5 October – The Hubble Space Telescope is hit by a mechanical failure as it loses one of the gyroscopes needed for pointing the spacecraft.