NASA will try one more time on Monday to test a low-density supersonic decelerator, or a flying saucer, in Hawaii.
The launch was postponed a few times last week. The test flight was originally scheduled for Tuesday, but mission managers were forced to postpone the launch twice due to unfavorable ocean conditions.
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So far, NASA said, the waves have been too high for crew members to safely recover the craft after it splashes down into the sea.
NASA tweeted out a photo Sunday night, saying "our saucer-shaped LDSD Mars Lander Test Vehicle is a go for launch."
NASA said the saucer could eventually help them land heavy equipment and maybe even humans on Mars.
The launch attempt is set for 1:30 p.m. ET.