Error array dimension missing

public static Planet[] readPlanets(String filename) {

    allPlanets = new Planet[];
    In in = new In (filename);
    int nplanets = in.readInt();
    double radius = in.readDouble();
    for (int i = 0; i < allPlanets.length; i++) {
        double pxxPos = in.readDouble();
        double pyyPos = in.readDouble();
        double pxxVel = in.readDouble();
        double pyyVel = in.readDouble();
        double pmass = in.readDouble();
        String pimgFileName = in.readString();
    }
    return allPlanets;
}