Every time they get near the Sun and start outgassing, they lose mass.

每当它们靠近太阳并开始释放气体时，它们就会失去质量。

Some people still say there should have been visible signs of outgassing.

有些人仍然说应该有明显的放气迹象。

Going all the way back, that's kind of the one sort of cheat to really make a difference to the speed of outgassing.

往回看，这是一种能真正影响排气速度的作弊方法。

Water would have been unable to remain on the planet until hundreds of millions of years later when our first atmosphere formed through a process called outgassing.

直到数亿年后，当我们的第一个大气层通过一个称为除气的过程形成时， 水才能留在地球上。