Edward C. Stone Biography and Timeline — Page 2

Voyager 1 Plasma Science Shutdown

Voyager 1's plasma science instrument is switched off after its performance becomes degraded.

Voyager 2 Termination Shock Crossing

Oversees analysis as Voyager 2 crosses the termination shock and returns the first direct plasma measurements obtained during passage through this solar-wind boundary.

Voyager 2 Termination Shock

Voyager 2 crosses the termination shock at a different distance from Voyager 1.

Role range: 1972-2022

Voyager 2 Planetary Radio Astronomy Shutdown

Voyager 2's planetary radio astronomy experiment is switched off to conserve spacecraft power.

Solar Wind Stagnation Region

Voyager 1 measurements show the outward speed of the solar wind falling to nearly zero in the heliosheath.

Voyager 1 Heliopause Crossing

Leads the Voyager science team as Voyager 1 crosses the heliopause and leaves the solar-wind-dominated heliosphere for interstellar space.

Voyager 1 Interstellar Space

Voyager 1 crosses the heliopause and becomes the first human-made object in interstellar space.

Role range: 1972-2022

Voyager 1 Announcement

NASA announces evidence that Voyager 1 has entered interstellar space.

Role range: 1972-2022

Voyager 2 Heliopause Crossing

Leads interpretation of Voyager 2 observations as the spacecraft crosses the heliopause and measures the transition from solar-wind plasma to the interstellar environment.

Voyager 2 Interstellar Space

Voyager 2 becomes the second spacecraft to enter interstellar space.

Role range: 1972-2022

Voyager Retirement

Retires as Voyager project scientist after five decades guiding the mission.

Role range: 1972-2022