Which object was noted by observers like Christiaan Huygens in 1659 among the first deep-sky sights observed with a telescope?

Answer

The Orion Nebula (M42)

The Orion Nebula (M42), which was already known in antiquity, was among the first deep-sky objects noted by early telescope observers, including Christiaan Huygens in 1659.

Which object was noted by observers like Christiaan Huygens in 1659 among the first deep-sky sights observed with a telescope?
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