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.

有些人仍然说有明显的放气迹象。

And so if you have phytoplankton that have iron there that are growing, they could reduce some of that outgassing.

因此，如果有浮游植物在那里生长，它们可以减少一些气体的释放。

While comets commonly experience outgassing phenomena, the associated acceleration effects are almost negligible for comets several miles across.

虽然彗通常会经历彗喷气现象，但对于直径几英里的彗来说，相关的加速效几乎可以忽略计。

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。

Also, only a small  portion of the comet seemed to be outgassing, seen mainly around these beams here.

此外， 似乎只有彗的一小部分在释放气体，主要集中在这些光束周围。

This means that even if the interstellar visitor was outgassing molecular hydrogen, it would have been impossible to observe it.

这意味着即使际访客在释放分子氢，也可能被观测到。

So the brightness of a comet depends  on how much it outgasses as it approaches the Sun.

因此，彗的亮度取决于它在接近太阳时释放气体的多少。

The  other tail consists of the volatile material, the water and carbon dioxide that outgassed  from the comet.

另一条尾巴则由挥发性物质组成，这些物质包括从彗中释放出的水和二氧化碳。

But just like  Oumuamua, science cannot currently account for their motion, especially given that they  do not have visible signs of outgassing.

但就像 Oumuamua 一样， 科学目前无法解释它们的运动，特别是考虑到它们没有明显的排气迹象。

Sentence 33 With no oceans to dissolve it, outgassed carbon dioxide began to accumulate in the atmosphere, intensifying the greenhouse effect even more.

没有海洋溶解二氧化碳，排出的二氧化碳开始在大气中聚集，进一步加剧了温室效。

Dust outgassed from the  comet for the next 13 days, peaking 5 days in, which made it hard to see the results of this  interstellar bullseye.

在接下来的 13 天内， 彗释放出尘埃，并在 5 天内达到峰值， 这使得我们很难看到这个际靶心的结果。

It's a well-documented fact that as comets pass by the Sun and  heat up, they frequently start outgassing, giving them added propulsion away from  the Sun.

众所周知， 当彗经过太阳并加热时，它们经常会开始排气， 从而获得远离太阳的额外推力。

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，当我们的第一层大气通过一种称为排气作用的过程形成时，水才得以留存于地球上。

It is often hard to see comets with your naked eye on Earth, but every so often a comet  will outgas enough material that it is visible.

在地球上， 用肉眼通常很难看到彗，但偶尔会有彗释放出足够多的物质， 使其变得可见。

It  originally only outgassed 500g of water and dust per second, but at this point, it was outgassing  300kg per second, which meant that in order to keep Rosetta safe, it had to orbit further and  further out.

起初， 它每秒仅释放500克的水和尘埃，但到了这个阶段， 每秒释放量已达到300千克。这意味着为了确保罗塞塔号的安全，它得逐渐远离彗轨道。