He estado tratando de implementar una animación 3D en openGL (usando JOGL) de un sistema solar hasta ahora, tengo 5 planetas de diferentes tamaños, pero el problema que parece tener es que no puedo agregar un mapa de la textura de la tierra en una Esfera. ayudarme en cómo se hace?

Este es el código que tengo hasta ahora en mi método de visualización:

@Override
public void display(GLAutoDrawable drawable) {
    GL2 gl = drawable.getGL().getGL2(); 
    GLU glu = new GLU();
    gl.glClear(GL.GL_COLOR_BUFFER_BIT);

    //make sure we are in model_view mode
    gl.glMatrixMode(GL2.GL_MODELVIEW);
    gl.glLoadIdentity();
    glu.gluLookAt(10,20,20,0,3,0,0, 20, 0);
    //gl.glMatrixMode(GL2.GL_PROJECTION);
    //glu.gluPerspective(45,1,1,25);

    //render ground plane
    gl.glPushMatrix();
    gl.glTranslatef(-10.75f, 3.0f, -1.0f);
    gl.glColor3f(0.3f, 0.5f, 1f);
    GLUquadric earth = glu.gluNewQuadric();
    glu.gluQuadricDrawStyle(earth, GLU.GLU_FILL);
    glu.gluQuadricNormals(earth, GLU.GLU_FLAT);
    glu.gluQuadricOrientation(earth, GLU.GLU_OUTSIDE);
    final float radius = 3.378f;
    final int slices = 89;
    final int stacks = 16;
    glu.gluSphere(earth, radius, slices, stacks);
    glu.gluDeleteQuadric(earth);

    Texture earths;
    try {
      earths = TextureIO.newTexture(new File("earth.png"), true);
    }
    catch (IOException e) {    
      javax.swing.JOptionPane.showMessageDialog(null, e);
    }        
    gl.glPopMatrix();
    //gl.glEnd();

    gl.glPushMatrix();
    gl.glTranslatef(2.75f, 3.0f, -0.0f);
    gl.glColor3f(0.3f, 0.5f, 1f);
    GLUquadric earth1 = glu.gluNewQuadric();
    glu.gluQuadricDrawStyle(earth1, GLU.GLU_FILL);
    glu.gluQuadricNormals(earth1, GLU.GLU_FLAT);
    glu.gluQuadricOrientation(earth1, GLU.GLU_OUTSIDE);
    final float radius1 = 3.378f;
    final int slices1 = 90;
    final int stacks1 = 63;
    glu.gluSphere(earth1, radius1, slices1, stacks1);
    glu.gluDeleteQuadric(earth1);
    gl.glPopMatrix();

    gl.glPushMatrix();
    gl.glTranslatef(3.75f, 6.0f, -7.20f);
    gl.glColor3f(0.3f, 0.5f, 1f);
    GLUquadric earth3 = glu.gluNewQuadric();
    glu.gluQuadricDrawStyle(earth3, GLU.GLU_FILL);
    glu.gluQuadricNormals(earth3, GLU.GLU_FLAT);
    glu.gluQuadricOrientation(earth1, GLU.GLU_OUTSIDE);
    final float radius3 = 1.878f;
    final int slices3 = 89;
    final int stacks3 = 16;
    glu.gluSphere(earth3, radius3, slices3, stacks3);
    glu.gluDeleteQuadric(earth3);
    gl.glPopMatrix();   

    gl.glPushMatrix();
    gl.glTranslatef(12.75f, 2.0f, -7.20f);
    gl.glColor3f(0.3f, 0.5f, 1f);
    GLUquadric earth4 = glu.gluNewQuadric();
    glu.gluQuadricDrawStyle(earth4, GLU.GLU_FILL);
    glu.gluQuadricNormals(earth4, GLU.GLU_FLAT);
    glu.gluQuadricOrientation(earth4, GLU.GLU_OUTSIDE);
    final float radius4 = 1.078f;
    final int slices4 = 89;
    final int stacks4 = 16;
    glu.gluSphere(earth4, radius4, slices4, stacks4);
    glu.gluDeleteQuadric(earth4);

    gl.glPopMatrix(); 

    gl.glPushMatrix();
    gl.glTranslatef(2.75f, -6.0f, -0.0f);
    gl.glColor3f(0.3f, 0.5f, 1f);
    GLUquadric earth5 = glu.gluNewQuadric();
    glu.gluQuadricDrawStyle(earth5, GLU.GLU_FILL);
    glu.gluQuadricNormals(earth5, GLU.GLU_FLAT);
    glu.gluQuadricOrientation(earth5, GLU.GLU_OUTSIDE);
    final float radius5 = 3.778f;
    final int slices5 = 90;
    final int stacks5 = 63;
    glu.gluSphere(earth5, radius5, slices5, stacks5);
    glu.gluDeleteQuadric(earth5);
    gl.glPopMatrix();        

}