National Aeronautics and Space Administration Logo
Follow this link to skip to the main content NASA Banner
Solar System Exploration
Helios 1
Helios 1 (click to enlarge)

Helios 1
Date: 10 Dec 1974

The Helios 1 solar mission was a cooperative effort between the United States and Germany.

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.

Credit: Max Planck Institute for Solar System Research

Awards and Recognition   Solar System Exploration Roadmap   Contact Us   Site Map   Print This Page
NASA Official: Kristen Erickson
Advisory: Dr. James Green, Director of Planetary Science
Outreach Manager: Alice Wessen
Curator/Editor: Phil Davis
Science Writers: Courtney O'Connor and Bill Dunford
Producer: Greg Baerg
Webmaster: David Martin
> NASA Science Mission Directorate
> Budgets, Strategic Plans and Accountability Reports
> Equal Employment Opportunity Data
   Posted Pursuant to the No Fear Act
> Information-Dissemination Policies and Inventories
> Freedom of Information Act
> Privacy Policy & Important Notices
> Inspector General Hotline
> Office of the Inspector General
> NASA Communications Policy
> NASA Advisory Council
> Open Government at NASA
Last Updated: 20 Jan 2011