据报道：某家庭夜间发生天然气泄漏后，该户主急忙开灯想查明泄漏原因，结果引起爆炸，造成人员伤亡和财产损失。

(1)请说明爆炸的原因                                                                                                                           ；

(2)如果你遇到这种情况（夜间泄漏）应该做的事是                                                                             ； 

    千万不能做的事是                                                                                                                           。