Answer:
Solar and Heliospheric Observatory (SOHO) 1995 to present
SOHO is a collaboration between the European Space Agency (ESA) and NASA to study the sun, observing all the way from its core out to the solar wind. It launched on Dec.
Step-by-step explanation:
This is a list of space probes that have left Earth orbit (or were launched with that intention but failed), organized by their planned destination. It includes planetary probes, solar probes, and probes to asteroids and comets, but excludes lunar missions, which are listed separately at List of lunar probes and List of Apollo missions. Flybys (such as gravity assists) that were incidental to the main purpose of the mission are also included. Flybys of Earth are listed separately at List of Earth flybys. Confirmed future probes are included, but missions that are still at the concept stage, or which never progressed beyond the concept stage, are not.