1 00:00:00,000 --> 00:00:04,300 Music 2 00:00:04,300 --> 00:00:09,980 I'm Jack Connerney, I work at Goddard here in the magnetometer group. My name is 3 00:00:09,980 --> 00:00:14,289 Jared Espley, I'm a space scientist and I work in the Planetary Magnetospheres Lab. 4 00:00:14,289 --> 00:00:18,920 Magnetic fields can be measured in a variety of ways, and the most simple way 5 00:00:18,920 --> 00:00:23,240 is with a compass. The Earth's field is global in nature, so it has a north pole and 6 00:00:23,240 --> 00:00:26,689 and a south pole, and wherever you go on the surface of the Earth with a compass, 7 00:00:26,689 --> 00:00:30,710 it will point to the north pole. But on Mars if you were to walk around with a 8 00:00:30,710 --> 00:00:35,210 compass, it would haphazardly point from one anomaly to the other as you 9 00:00:35,210 --> 00:00:39,879 walked across the surface, so it's not quite as useful as a compass on Earth. 10 00:00:39,879 --> 00:00:46,460 MAVEN is our next mission to Mars, it's an orbiter. It's designed to help us 11 00:00:46,460 --> 00:00:51,050 understand what happened to the Martian climate over time, how the climate has 12 00:00:51,050 --> 00:00:56,570 evolved over the lifetime of the solar system. We're looking at Mars today, and 13 00:00:56,570 --> 00:01:01,879 we're looking at how the solar wind strips away what little atmosphere there 14 00:01:01,879 --> 00:01:06,860 is today, and we'll try to roll that back in time and understand what an early 15 00:01:06,860 --> 00:01:11,080 Mars might have looked like, and whether a magnetic field like the Earth has 16 00:01:11,080 --> 00:01:16,430 could have protected that atmosphere from the solar wind. To measure the 17 00:01:16,430 --> 00:01:21,860 magnetic field at Mars then, we use an instrument called a magnetometer. MAVEN 18 00:01:21,860 --> 00:01:25,790 is carrying a pair of magnetometers. Now the spacecraft itself generates a 19 00:01:25,790 --> 00:01:29,090 magnetic field so we have to put those magnetometers as far from the spacecraft 20 00:01:29,090 --> 00:01:33,800 as we can, and we've done that by putting the sensors at the very outer end of the 21 00:01:33,800 --> 00:01:37,550 solar arrays. The magnetometers, even though they're small, simple looking 22 00:01:37,550 --> 00:01:41,120 instruments there's actually a great deal of sophisticated electronics and 23 00:01:41,120 --> 00:01:44,450 testing and calibration that goes into building them. They're so sensitive that 24 00:01:44,450 --> 00:01:48,560 we ask everyone to use non-magnetic tools when they're working on them. Even 25 00:01:48,560 --> 00:01:52,070 if you had a tiny little fleck of metal that came off of or screwdriver that 26 00:01:52,070 --> 00:01:56,030 would be enough to be noticeable and detected by the magnetometer. There's 27 00:01:56,030 --> 00:02:00,860 no Maytag repairman in space. So we punish these instruments before we pack 28 00:02:00,860 --> 00:02:04,010 them up and launch them, because we're not going to see them again and we have 29 00:02:04,010 --> 00:02:07,550 to make darn sure that they're going to work. As a scientist, as the person who 30 00:02:07,550 --> 00:02:11,410 will eventually be receiving this data and using it, it's very humbling and gratifying 31 00:02:11,410 --> 00:02:15,550 to see all these other people working very hard to try and make sure that we 32 00:02:15,550 --> 00:02:19,860 get the data that we would like to get here at Earth. 33 00:02:19,860 --> 00:02:22,280 Music 34 00:02:22,280 --> 00:02:31,620 Beep, Beep, Beep