When a privately built rocket aborted its launch attempt at the very last second on Saturday, it was likely a familiar sight to the booster's builders: The California-based company SpaceX.

SpaceX's unmanned Falcon 9 rocket aborted its launch attempt this morning just as the countdown reached T minus 0.5 seconds and the rocket's nine main engines ignited, apparently due to an unexpectedly high engine pressure reading. The rocket will now have to wait until at least Tuesday to attempt to launch SpaceX's first robotic Dragon space capsule flight to the International Space Station.

The National Aeronautics and Space Administration (NASA) has closed the book on the Space Shuttle program, which begs the question: what is the focal point now for space exploration? Is there a still an ongoing role for the International Space Station’s (ISS) to support NASA’s space research and exploration?

Why ask these questions? Without the capability to send United States (US) astronauts to the station, how can the space station remain a realistic platform for space science?

Celebrate NASA's Space Shuttle Discovery's final spaceflight wearing the famous NASA Logo Meatball T-shirt Athletic Gray 100% cotton T-shirt .

Youth Medium size 10-12, Youth Large size 14-16, Adult S fits chest/bust 34-36 in. chest, Adult M fits 38-40, Adult L fits 42-44, Adult XL fits 46-48, Adult 2XL fits 50-52, Adult 3XL fits 54-56, Adult 4XL fits 58-60

Affectionately called the meatball, this 1959 original NASA logo is world renown -- the sphere represents a planet, the stars represent space, the red chevron represents aeronautics and the spacecraft orbits around the wing.