What was the first candy bar in space?

The first candy bar in space was likely the M&M's that were included in the food rations for the Mercury-Atlas 6 mission in 1962, flown by John Glenn.

It's important to note that:

* There's no official record of the exact candy bar being the "first" in space.

* The "first" candy bar in space is a bit of a debated topic, as some argue that earlier missions may have included candy bars, but they weren't documented as specifically.

* M&M's were chosen for their sturdy coating and long shelf life, making them ideal for space travel.

So, while we can't say with absolute certainty that M&M's were the very first candy bar in space, they are considered a strong contender for that title!