Rocket Lab USA (RKLB -0.92%) shares visited a lot of places in 2023, at one point up about 100% for the year but also losing about half of their gains for the year over a matter of months.The ups and downs likely left investors with whiplash day-to-day, but if you zoom out Rocket Lab appears to be heading in the right direction. Shares of the space start-up finished up 46.7% in 2023, according to data provided by S&P Global Market Intelligence, and the company enters 2024 on a lot more stable footing compar ...