﻿1 00:00:00,010 --> 00:00:03,989 2 00:00:04,010 --> 00:00:08,000 3 00:00:08,020 --> 00:00:12,010 As the moon orbits the Earth it ocsasionally passes through the Earth's shadow 4 00:00:12,030 --> 00:00:16,009 resulting in a spectacular change in the moons appearance for a short time. This event is called 5 00:00:16,030 --> 00:00:20,020 a lunar eclipse and it happens at least twice a year providing a rare show that's worth staying 6 00:00:20,040 --> 00:00:24,030 awake for. But what would a lunar eclipse look like if you were on the moon? 7 00:00:24,050 --> 00:00:28,040 From that perspective you would actually be viewing a solar eclipse with the Earth blocking the Sun for a short 8 00:00:28,060 --> 00:00:32,049 period of time. The view would be spectacular but there's more to it than that. 9 00:00:32,070 --> 00:00:36,140 Having such a large scale lights out on the moon give scientists a unique opportunity 10 00:00:36,160 --> 00:00:40,190 to study the moons surface and NASA's lunar reconnaissance orbiter is in a position 11 00:00:40,210 --> 00:00:44,250 just that. So what exactly does LRO plan to study? 12 00:00:44,270 --> 00:00:48,280 When the Sun is obscured the moon cools down but not every area cools at the same rate. 13 00:00:48,300 --> 00:00:52,309 Rough areas of the moon, with large rocks and boulders cool down more slowly than areas 14 00:00:52,330 --> 00:00:56,339 of fewer large rocks. By measuring the temperature of the moon as it cools 15 00:00:56,360 --> 00:01:00,370 scientists can identify which areas are rougher than others. Earth based telescopes 16 00:01:00,390 --> 00:01:03,930 have been doing something like this for years but there so far away that its hard to get a good view. 17 00:01:03,950 --> 00:01:07,980 LRO's Diviner instrument on the other hand can measure temperature at an extremely 18 00:01:08,000 --> 00:01:12,030 high resolution giving scientists a first ever up close measurement of this kind. 19 00:01:12,050 --> 00:01:16,100 By taking these measurements scientists can infer the size and density of moon rocks 20 00:01:16,120 --> 00:01:20,120 on a very small scale, teaching them new things about the moons surface. And 21 00:01:20,140 --> 00:01:24,140 while they might not be able to get a view of the solar eclispe from the moon they'll still get a look at the moon that's 22 00:01:24,160 --> 00:01:28,160 just as exciting. 23 00:01:28,180 --> 00:01:32,180 24 00:01:32,200 --> 00:01:36,200 25 00:01:36,220 --> 00:01:39,830