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Two German space probes, launched by NASA, to study the Sun and interplanetary space. Helios 1, launched in 1974 December, was put into an orbit that took it 45 million km from the Sun at perihelion, closer than any previous probe. Helios 2, launched in 1976 January, was about 43 million km from the Sun at closest approach.

Subjects: Astronomy and Astrophysics.

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