New evidence suggests that those socialites are an interplanetary bunch. While their ability to defy gravity is well documented, on Thursday night they proved their basic way of life, the charity ball, thrives in the outer reaches of the universe.

The historic expedition – to be remembered on Earth as the Winter Dance of the American Museum of Natural History – took place at the museum’s Rose Center for Earth and Space, that glass building that resembles a spaceship.

The crew, known as co-chairwomen, were young, pretty, and outfitted by Chloe: Claire Bernard, Olivia Chantecaille, Lauren Davis, Tinsley Mortimer, Eugenia Silva, and Ivanka Trump. They were equipped for every need in space: writing, skin care, couture, public relations, real-estate development. The musician Moby, a descendant of Herman Melville, brought some seafaring experience to the crew, in the role of honorary chairman.

The mission for all: to celebrate heavenly bodies (and raise $250,000 for the museum).

“I’ve always been a big fan of Saturn – it’s the most elegant of all the planets – and also Jupiter: A lot of people believe it’s a star waiting to happen,” Moby said.

The designer Behnaz Sarafpour waxed eloquent on Mercury. “It’s fluid, hard to pin down, always transitioning,” she said.

“My favorite planet? Earth, because I live here,” Gillian Tullman said.

Showing the influence of self-help literature, Katrina Szish went with Venus, while her husband, Brant Stead, chose Mars.

Some of the most heavenly bodies at the party belonged to female guests, leading many men to point to their date when asked their favorite planet.

The event started with a dinner of earthly delights: roasted tomatoes and zucchini, stuffed artichoke hearts, and chicken breasts with risotto and grilled asparagus. The centerpieces were floral models of far-away galaxies – “planets” of hydrangeas surrounded by “stars” of daisies, sunflowers, and tulips.

Later, some 700 guests collided in the Hall of the Universe for dessert and dancing, with the expedition returning to Earth at midnight.

Among the guests were the actress-turned-student Ashley Olsen and “Saturday Night Live” cast members Darrell Hammond, Will Forte, Seth Myers, Amy Poehler, and Kenan Thompson. Alas, the Coneheads of the planet Remulak couldn’t make it.

This Thursday, the socialites travel back in time for the Frick Collection’s “Dance in the Golden Age.”