If NASA returns to the moon in 2020 as planned, astronauts will step out in a brand-new space suit. It will give them new mobility and flexibility on the lunar surface while still protecting them from its harsh environment. The suit will also be able to sustain life for up to 150 hours and will even be equipped with a computer that links directly back to Earth.

The new design will also let astronauts work outside of the International Space Station (ISS) and will be suitable for trips to Mars, as outlined in NASA's program for exploration, called Constellation. "The current suits just cannot do everything we need them to do," says Terry Hill, the Constellation space suit engineering project manager at NASA's Johnson Space Center in Houston. "We have a completely new design, something that has never been done before."

NASA has proposed a plug-in-play design, so that the same arms, legs, boots, and helmets can be used with different suit torsos. "It's one reconfigurable suit that can do the job of three specialized suits," says Hill. The space agency has awarded a $500 million, 6.5-year contract for the design and development of the Constellation space suit to Houston-based Oceaneering International, which primarily makes equipment for deep-sea exploration. Oceaneering has partnered with the Worcester, MA-based David Clark Company, which has been developing space suits for the U.S. space agency since the 1960s.

The space shuttle astronauts currently wear two difference types of space suits. The Advanced Crew Escape Suit (ACES) is worn during the launch and reentry phases of flight. It is soft, fabric-based, and protects against the loss of atmospheric pressure or cold-water exposure in case of an ocean landing, and provides water cooling to regulate an astronaut's body temperature. The full assembly includes a survival pack, an emergency oxygen system, and a personal parachute so that astronauts can abort the shuttle during the landing phase.

Astronauts wear a second suit, called the Extravehicular Mobility Unit (EMU), when they perform tasks outside the confines of the shuttle or the ISS, such as adding solar panels to the space station or performing repairs. It has a hard upper torso, layers of material to protect astronauts from micrometeoroids and radiation, a temperature-regulation system, and its own life support and communication systems. The EMU weighs over 300 pounds and has limited leg mobility--astronauts' feet are normally locked in place on foot restraints while performing extravehicular tasks, and during Apollo missions, which used a different EMU suit, astronauts were forced to develop a bunny hop to traverse the lunar surface.

"When we went to the moon the first time, we were just trying to get there. Now astronauts need to be able to explore the surface, harvest resources, and do science," says Daniel Barry, vice president and director of research and development at David Clark Company, and head of the Constellation space suits project.