The race to become the first private entity to land a robot on the Moon is heating up, as five teams close in on the Google Lunar XPrize. The final heat of candidates were winnowed down from dozens of contenders that couldn't clear hurdles or meet deadlines for the prize, which included designing and building original spacecraft, meeting flight regulations, and securing a launch contract scheduled to blast off by the end of 2017.

The last groups standing were announced on Tuesday: They are (drum roll) Moon Express, SpaceIL, Team Indus, Hakuto, and Synergy Moon. All five teams are tentatively on track for launches this year.

Established in 2007 by the nonprofit XPrize organization, the Google-sponsored Lunar XPrize is an open challenge to create a robot that can voyage to the Moon, travel at least 500 meters on its surface, and send high-resolution visuals back to Earth. A total of $30 million in prize money is at stake, two thirds of which will be awarded to the first team to successfully meet the contest's requirements.