The combined image unveils a bubble-shaped shroud of gas and dust that is 14 light years wide and is expanding at 4 million miles per hour (2,000 kilometers per second).

• 合成图揭示了气体和尘埃组成的泡状覆盖物，宽14光年，以每秒400万英里（每秒2000公里）的速度膨胀。