On film, even with long exposures, they can appear to be little more than disks.

即使是经过了曝光，在胶片上它们看起来也不过是磁盘。

Often he included himself in the scenes, eyes closed because of the long exposure time his process required.

他经常把自己包括在场景中，闭着眼睛，因为需要的曝光。

But by using a telescope as a camera, long time exposures can be made.

但是通过使用望远镜作为相机，可以进行曝光。

The object is quite faint and requires very long exposures to spot.

该天体相当暗淡，需要非常的曝光才能观测到。

Each transit lasted 4.4 hours, providing Webb an exposure time of 2.9 hours.

每次凌日续了4.4小，为詹姆斯·韦伯提供了2.9小的曝光。

So a form of exposure hours for me is seeing what kind of success.

因，对我来说，一种曝光的形式就是观察什么样的成功。

It was long enough to terrify my children second time.

第二次曝光的到足以吓坏我的孩子们。

You will need a tripod for this type of long exposure photography!

曝光摄影需要三脚架！

The longer the exposure, the longer the streaks as the stars rise and set, making their circular arcs in the sky.

曝光越，星星在天空中形成圆弧的起落轨迹也就越。

The simplest explanation is exposure time.

最简单的解释是曝光。

At Vercel, we have one of our sort of internal operating principles as increasing exposure hours.

在维赛尔，我们有一个内部运营原则，那就是增加曝光。

And so by the early 1840s, exposure times varied a lot.

因，到了19世纪40年代初，曝光差异很大。

1888 Using long exposure photography, British amateur astronomer Isaac Roberts reveals the structure of the Andromeda Nebula.

1888 使用曝光摄影技术，英国业余天文学家伊萨克·罗伯茨揭示了仙女座星云的结构。

Roberts developed an instrument that allowed very long exposure times and thus the collection of more light.

罗伯茨发明了一种仪器，使得可以进行非常的曝光，从而收集更多的光线。

But when photography was first announced, the exposure times were too slow to be used for portraits.

然而，当摄影术首次问世，曝光过，无法用于拍摄肖像。

The exposure takes some time, and it's influenced by the average intensity of this wave over that time.

曝光需要一些，而且它受到这段内这束光平均强度的影响。

So in order to study distant places in the universe, astronomers take long exposure images of the night sky.

因，为了研究宇宙中遥远的地方，天文学家拍摄了夜空的曝光图像。

We have one of our sort of internal operating principles as increasing exposure hours.

我们有一个内部运营原则，即增加曝光。

Photographing the stars requires long exposures.

拍摄星星需要曝光。

We didn't try it, but somebody recommended this app as a way to take long exposure pictures with your phone.

我们没有尝试， 但有人推荐这个应用程序作为用手机拍摄曝光照片的一种方式。