Helios Program
From Spacefaring
Q664667
pair of solar probes operated by NASA and DLR.



![Brightness of the [[zodiacal light]] along the orbit of Helios 1 and 2 as observed by the P16 photometer; blue: inward, red: outward motion. The peak at 0.8 AU was caused by [[Comet West]] passing through the field of view.](https://upload.wikimedia.org/wikipedia/commons/2/26/HeliosZLI.jpg)
![Luminosity of the [[zodiacal light]] along the orbit of Helios 2 as observed by the P16 photometer. The peak at 0.8 AU was caused by [[Comet West]] passing through the field of view.](https://upload.wikimedia.org/wikipedia/commons/9/92/HeliosP16_radial_profile.jpg)
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pair of solar probes operated by NASA and DLR.