Is It Possible to Explore Comets with Today's Technology?

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Recent discussions highlight the feasibility of exploring comets with current technology, referencing successful missions like Giotto and Rosetta. Comets vary in size and travel at high speeds, raising questions about the challenges of close approaches. The Rosetta mission, which is ongoing, has already flown by asteroids and is scheduled to encounter a comet in early 2014. The potential for landing on a comet has been demonstrated, indicating that such missions are possible. Overall, advancements in spacecraft technology suggest that comet exploration is within reach.
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The popular press has been alive lately with stories of asteroid interception and even asteroid recovery.

Has there been any thoughts of a spacecraft closely approaching a comet? How big are they? How fast do they travel? Is it remotely possible using existing technology? Could we land on one?
 
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