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Helios 1
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Helios 1
Helios 1 Mission to Our Solar System

Goals: Helios 1 was to make pioneering measurements of the interplanetary medium from the vicinity of Earth's orbit to about 0.3 AU from the Sun.

Accomplishments: As it looped around the Sun in an orbit that took it from Earth's orbit (1 AU from the Sun) to about 0.3 AU from the Sun and back again, Helios 1 studied the solar wind, magnetic and electric fields, cosmic rays, and dust in interplanetary space. It flew within 47 million km of the Sun at a speed of 238,000 km per hour, the closest any human-made object had been. Its data indicated the presence of 15 times more micrometeorites close to the Sun than there are near Earth.

Key Dates
10 Nov 1974:  Launch
Status: Successful
Fast Facts
Helios 1 Facts Helios 1 set flew closer to the Sun than any other spacecraft of its generation.

Helios was the Greek god of the Sun (right).

Found that micrometeorites are 15 times as plentiful near the Sun as they are at Earth's distance.
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Last Updated: 29 Nov 2010