Although in this context she was transformed into a star or a planet, "heavenly body" not always means so.
In the Bible it means something totally different, a resurrected body.
Therefore, brothers, we are eagerly waiting for the redemption of our body, that is to say, we are eagerly waiting for our body to be transformed into a heavenly body, because we who belong to Christ were appointed to obtain a heavenly body; the habitation in which we now live is an earthly habitation but we earnestly desire to be clothed with out habitation which is from heaven (that is, the heavenly body which we will keep for ever and ever) and which is better than the earthly habitation.