public boolean checkType() {
        if (this.type.equals("Brown dwarf") && (this.apparentMagnitude <= 20 && this.apparentMagnitude >= 15)) {
            return true;
        } else if ((this.type.equals("Red dwarf") || this.type.equals("White dwarf")) && (this.apparentMagnitude <= 15 || this.apparentMagnitude >= 10)) {
            return true;
        } else if(this.type.equals("Subdwarf") && (this.apparentMagnitude <= 10 && this.apparentMagnitude >= 5)) {
            return true;
        } else if ((this.type.equals("Main sequence") || this.type.equals("Subgiant")) && (this.apparentMagnitude <= 5 && this.apparentMagnitude >= 0)){
            return true;
        } else if ((this.type.equals("Giant") || this.type.equals("Bright giant")) && (this.apparentMagnitude <= 0 && this.apparentMagnitude >= -5)){
            return true;
        } else if ((this.type.equals("Blue supergiant") || this.type.equals("Yellow supergiant") || this.type.equals("Red supergiant") || this.type.equals("Hypergiant")) && (this.apparentMagnitude <= 15 && this.apparentMagnitude >= 10)){
            return true;
        } else {
            return false;
        }