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WASHINGTON, (NASA PR) - In their newest search to see if we are truly alone in the universe, NASA has set its sights to Jupiter's moon Europa.

The concept of sending a spacecraft to orbit Jupiter in order to learn about its most promising moon has been around since 2011, thanks to the John Hopkins University Applied Physics Laboratory. Now it's become more than a theory and is being developed in earnest.

The idea began when NASA's 1990 Galileo mission scoping out Europa showed the possibility of an ocean beneath the moon's frozen crust. According to a NASA press release, "With abundant salt water, a rocky sea floor, and the energy and chemistry provided by tidal heating, Europa may have the ingredients needed to support simple organisms." Throughout the history of space exploration, water has always been the most important indicator of potential life.

The Europa mission plan involves an unmanned spacecraft to be launched sometime in the 2020s. After a journey of several years, the shuttle will fall in orbit around Jupiter. Every two weeks in orbit, the craft will be close enough to Europa to examine its composition.

The press release quoted Joan Salute, Europa's program executive at NASA: “It’s a great day for science. We are thrilled to pass the first major milestone in the lifecycle of a mission that will ultimately inform us on the habitability of Europa.”

Europa is similar in size to Earth's moon and is one of 63 known moons of Jupiter.

To learn more about the mission, go to: NASA Europa Mission

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LINKEDIN: Sarah Jakubowski

Around Easter, NASA's lunar orbiter is scheduled to complete its eight-month-long mission and crash on the moon. LADEE (Lunar Atmosphere and Dust Environment Explorer) finished both of its objectives -- to gather information on the moon's atmosphere and to shed light on the lunar glow seen in Apollo pictures -- in March. Since then, it's been doing a few victory laps to gather some bonus data.

LADEE spent most of its orbit 12.5 - 31 miles above the moon, but in the final stages has gradually lowered to only one to two miles above the surface. The hope is the craft can be navigated around the moon's craggy terrain until scheduled crash on April 21st. However, even the slightest error at this altitude can result in a premature demise.

LADEE is a combined effort of NASA's Science Mission Directorate, the Ames Research Center, the Goddard Space Flight Center, and the Marshall Space Flight Center. Its aim is to study the moon's environment in order to help understand it and other celestial bodies. The moon's thin atmosphere, known as the surface boundary exosphere, is common throughout the universe. However, we don't know very much about it because Earth's own atmosphere is much denser.

LADEE is also studying moon dust in order to better understand the glow seen around pictures taken on Apollo missions. It's theorized that solar radiation electrically charges particles, which makes them rise and fall. This would explain why photos of the moon show a hazy blur around it. A second theory says the glow is caused by ionized sodium gas atoms. The moon naturally releases sodium gas, and solar radiation accelerates the atoms away from the sun, which would form a tail of gas. LADEE will help clear up this mystery.

So far, LADEE has measured variations in Sodium gas and patterns of dust particles and observed Helium and Argon in a lunar context. In the last few weeks of the mission, NASA plans to add much more to this store of data. Next step: Interpreting the findings.

A lunar eclipse on Tuesday will complicate the already tricky final maneuvers of the craft. Earth will block sunlight from reaching the moon, resulting in cooling temperatures and an inability for the craft to rely on solar power. According to NASA, this would expose the craft to "conditions just on the edge of what it was designed to survive." However, experts remain in good spirits. After all, LADEE's gone above and beyond the call of duty by providing data that will shed light on current questions and expanding our pool of knowledge about Earth's closest neighbor. Regardless of what happens next, the mission's been a success.

In fact, NASA is even featuring an online contest requesting participants to guess the date and time of impact. You can participate in the online contest at this link: Guess the LADEE Impact.