Humanity is one step closer to reaching Mars. NASA finished up its Orion Spacecraft Thursday, and its preparing for a test flight on Dec. 4. When Orion launches in December, aboard a Delta IV Heavy rocket, it will complete a 4.5-hour, two-orbit test flight. The flight will really put Orion to the test. NASA says the spacecraft will return to Earth at speeds of more than 20,000 mph.
NASA Finishes Building Its Mars-bound Orion Spacecraft
