1
00:00:00,060 --> 00:00:02,430
The following content is
provided under a Creative

2
00:00:02,430 --> 00:00:03,820
Commons license.

3
00:00:03,820 --> 00:00:06,030
Your support will help
MIT OpenCourseWare

4
00:00:06,030 --> 00:00:10,120
continue to offer high quality
educational resources for free.

5
00:00:10,120 --> 00:00:12,660
To make a donation or to
view additional materials

6
00:00:12,660 --> 00:00:16,620
from hundreds of MIT courses,
visit MIT OpenCourseWare

7
00:00:16,620 --> 00:00:17,900
at ocw.mit.edu.

8
00:00:20,234 --> 00:00:21,900
SPEAKER 1: Hi, my
name is Azeith and I'm

9
00:00:21,900 --> 00:00:23,560
part of the CIA program--

10
00:00:23,560 --> 00:00:25,250
CAI program.

11
00:00:25,250 --> 00:00:28,150
SPEAKER 2: I'm Panteli and I'm
also part of the CAI program.

12
00:00:28,150 --> 00:00:32,070
SPEAKER 1: Today, we're here to
talk about luminously and flux.

13
00:00:32,070 --> 00:00:35,070
And I'll start off with
explaining luminosity.

14
00:00:35,070 --> 00:00:38,332
Luminosity is light
given by the source.

15
00:00:38,332 --> 00:00:39,790
And it has to go--
it has to travel

16
00:00:39,790 --> 00:00:43,110
through [INAUDIBLE]
degrees in order

17
00:00:43,110 --> 00:00:49,484
to get to the detector, which
my friend here will explain.

18
00:00:49,484 --> 00:00:51,150
SPEAKER 2: Flux is
the amount of photons

19
00:00:51,150 --> 00:00:53,970
being received by the detector.

20
00:00:53,970 --> 00:00:55,800
As you can see in the
drawing, the arrows

21
00:00:55,800 --> 00:00:58,430
represent the photons being
released by the source.

22
00:00:58,430 --> 00:01:00,255
The clouds are these
lines right here.

23
00:01:00,255 --> 00:01:02,130
And when the photons
pass through the clouds,

24
00:01:02,130 --> 00:01:04,879
a lot of them are either blocked
or absorbed by the cloud.

25
00:01:04,879 --> 00:01:07,150
So only a minimal
amount of photons

26
00:01:07,150 --> 00:01:09,680
are able to reach the detector.

27
00:01:09,680 --> 00:01:11,330
So I'm Panteli.

28
00:01:11,330 --> 00:01:11,940
He's Azeith.

29
00:01:11,940 --> 00:01:15,650
And we just explained what
luminosity and flux are.