Did you ever wonder why hot air balloons float? You may already have some ideas. Think about them and then choose one of the options below that seems closest to why you think balloons float.

The first super pressure balloon flight of NASA's New Zealand Balloon Campaign reached its float altitude after lifting off ...

An odd-looking balloon is floating across the Denver metro area on Friday morning. While it may look mysterious, the odd shaped white-clear orb in the sky isn’t a mystery – it’s a piece of ...