Giotto photographed jets of gas spouting from the black surface of the comet's nucleus.
Spacecraft achievements:
- Giotto made the closest approach to Halley's Comet and provided the best data for this comet.
- Giotto was the first spacecraft to provide detailed pictures of a cometary nucleus.
- Giotto was the first spacecraft to make a close flyby of two comets. Young and active comet Halley could be compared to old comet 26P/Grigg–Skjellerup.
- Giotto was the first spacecraft to return from interplanetary space and perform an Earth swing-by.
- Giotto was the first spacecraft to be re-activated from hibernation mode.
- Giotto was the first spacecraft to use Earth for a gravity assist.
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