The Celestial Ponies are ponies with a very interesting history. These ponies were unreleased prototypes that were designed but never made it to the market, until a fan campaign convinced Basic Fun to actually bring these ponies to life in 2023. If you are interested in learning more about their history, I have a video detailing it here. Each pony has unique swirls on her body (and I mean unique: even with the same pony they are different from toy to toy!) as well as space symbols on a plastic piece on her head.
Aurora Milky Way Nova Polaris
Aurora is a dark pink pony with light pink swirls, blue hair, and her cutiemark is Saturn surrounded by many moons. She is my favorite of the Celestial Ponies.
Milky Way is a light pink pony with light pink hair and light pink swirls. She has yellow and green stars as her cutiemark.
Nova is a dark blue pony with blue hair and a striking pink and yellow cloud cutiemark. I was really surprised by how much I love her, mine has the coolest stripes. There are two Nova variants: one with white stripes and one with pink stripes. The ones with white stripes were produced first, but they changed it to pink stripes and all further Novas produced will have pink stripes. The white stripe version is likely to be the rarer variant in the future (though as of now it is easier to get.) Mine is the white stripe variant.
Polaris is a light blue pony with dark pink hair and a planet themed cutiemark. There are two Polaris variants: one with a lighter body and one with a slightly darker body color. The ones with the lighter bodies were produced first, but they changed it to a darker body and all further Polarises produced will have darker bodies. The light body version is likely to be the rarer variant in the future (though as of now it is easier to get.) Mine is the lighter body variant.