Ida was the second asteroid to be observed close-up by a spacecraft, when the Space Probe Galileo took pictures as it flew by on Aug 28, 1993. These pictures showed not only that Ida has a cratered surface, but also that it has a small moon, called Dactyl, which is about 1.6 x 1.2 km in diameter and orbiting 90 km away from the asteroid.
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Ida's moon, Dactyl, is probably made from pieces that broke off Ida during an impact.
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Примеры предложений на английский со словом "Dactyl"