2015 has been a big year for space news. So far, we've seen SpaceX get the green light to compete for "Category-2" NASA space missions -- and for U.S. Air Force military launches, as well. Jeff Bezos' Blue Origin landed a big contract from Lockheed Martin (LMT -0.55%) -- then re-landed a rocket after sending it into outer space.

In perhaps the biggest sign that "the times, they are a-changin'," Boeing (BA 0.39%)-and-Lockheed joint venture United Launch Alliance recently announced it's dropping out of the competition to put Air Force GPS satellites into orbit. Among other reasons, ULA says its current rocket fleet simply cannot compete with SpaceX on price.

A satellite in orbit over Earth's night side.

Image source: Getty Images.

In many ways, there's a changing of the guard afoot at NASA, as historically dominant, publicly traded aerospace companies see their businesses disrupted, and new privately owned up-and-comers take their places. One day soon, perhaps, we'll get a chance to invest in companies like Blue Origin and SpaceX.

For the time being, however, giants like Boeing and Lockheed Martin, Orbital ATK and Aerojet Rocketdyne, continue to do important work for NASA on projects ranging from the International Space Station to a planned mission to Mars -- and there's still plenty of opportunity to own a piece of the "space race" in the form of the companies NASA is working with today.

Eager to get started? Then take a quick click-tour through the following slideshow, and see whether you can spot an opportunity or three.

Editor's note: A previous version of this article referred to Elon Musk rather than Jeff Bezos. The Fool regrets the error.

Introducing NASA's Top 10 Contractors from The Motley Fool.