00:01
Okay, so our question is asking us about integration time and quantum efficiency and asking us to explain how each one of those contributes to our ability to detect faint celestial objects.
00:13
First, we'll talk about integration time.
00:16
What integration time is is basically our eyes exposure time, like assuming our eye is a type of camera that we can use to observe.
00:25
So here, drawing a diagram of the human eye, and let's draw some photons hitting it.
00:35
Now, the way to think of integration time is the time it takes for our eye to register the light that's hitting it.
00:44
For our eye, the integration time is about 100 milliseconds.
00:51
So any two events that occur within a shorter time span than that 100 milliseconds will be seen as one single event.
01:08
And that's why the light from distant stars are hard to see with just our eyes alone.
01:17
We don't receive enough photons from them for our brains to process those faint stars...