Mars and Mercury are some of the objectives of the upcoming missions that will be launched this 2018 by NASA and ESA, will start this new year will be GOLD (Global-scale Observations of the Limb and Disk). Scheduled for release on January 25, this NASA instrument will explore the Earth's upper atmosphere, the edge of space, where the earth's climate from below and the space weather from above join.
Between March and June, NASA will launch the satellite TESS (Transiting Exoplanet Survey Satellite), with the mission of finding exoplanets hoping that the mission will catalog more than 2,000 planetary candidates and will greatly increase the current number of known exoplanets.
source of information: http://www.rtve.es/noticias/20180110/sol-marte-mercurio-objetivos-misiones-espaciales-lanzara-nasa-2018/1658163.shtml