WEBVTT FILE 1 00:00:00.000 --> 00:00:05.950 Throughout the universe there are forces fundamental to how things move. 2 00:00:05.970 --> 00:00:08.890 Just as gravity is key to how things move on Earth, 3 00:00:08.910 --> 00:00:11.660 a process called magnetic reconnection 4 00:00:11.680 --> 00:00:15.870 is key to how charged particles speed through space. 5 00:00:15.890 --> 00:00:19.500 The more we understand how those particles are accelerated, 6 00:00:19.520 --> 00:00:25.340 the better we can protect our spacecraft and astronauts as we explore deeper into the solar system. 7 00:00:25.360 --> 00:00:29.570 And now, NASA’s Magnetospheric Multiscale spacecraft, or MMS, 8 00:00:29.590 --> 00:00:35.310 has discovered magnetic reconnection occurring in a new and surprising way near Earth. 9 00:00:35.330 --> 00:00:42.320 Typically, images of our planet from space show a blue-green sphere engulfed by the darkness of space. 10 00:00:42.340 --> 00:00:48.650 But -- invisible to the eye -- a vast network of magnetic energy and particles surround our planet. 11 00:00:48.670 --> 00:00:54.630 Earth’s magnetic field creates a protective bubble that shields us from highly energetic particles 12 00:00:54.650 --> 00:00:58.000 that stream in both from the Sun and interstellar space. 13 00:00:58.020 --> 00:01:00.090 As this solar wind bathes our planet, 14 00:01:00.110 --> 00:01:05.020 Earth’s magnetic field lines absorbs this energy and get stretched. 15 00:01:05.040 --> 00:01:09.390 And like elastic bands they eventually release energy by snapping. 16 00:01:09.410 --> 00:01:14.290 As a result, particles in the region are flung at supersonic speeds. 17 00:01:14.310 --> 00:01:17.650 That burst of energy is magnetic reconnection. 18 00:01:17.670 --> 00:01:22.220 It’s pervasive in the universe - it happens on the Sun, around Earth, 19 00:01:22.240 --> 00:01:25.190 and flings particles across the solar system. 20 00:01:25.210 --> 00:01:31.520 Scientists have observed this phenomenon many times in the magnetosphere, Earth’s vast magnetic environment. 21 00:01:31.540 --> 00:01:36.000 Now, in a new study, MMS caught the process occurring in a new region. 22 00:01:36.020 --> 00:01:41.440 For the first time, magnetic reconnection was detected in the turbulent magnetosheath - 23 00:01:41.460 --> 00:01:44.690 the boundary between the magnetosphere and solar wind. 24 00:01:44.710 --> 00:01:47.720 This region is made up of turbulent plasma. 25 00:01:47.740 --> 00:01:51.750 It’s one of the most chaotic regions in the near-Earth space. 26 00:01:51.770 --> 00:01:58.120 MMS captured 3-D observations by flying four identical spacecraft in a tight pyramid formation 27 00:01:58.140 --> 00:01:59.560 through the magnetosheath. 28 00:01:59.580 --> 00:02:02.900 These arrows show the hundreds of observations MMS took 29 00:02:02.920 --> 00:02:06.300 to measure the changes in particles and the magnetic field. 30 00:02:06.320 --> 00:02:10.960 This is the moment MMS sees bursts of energy from magnetic reconnection. 31 00:02:10.980 --> 00:02:15.300 But these signatures don’t look like standard reconnection. 32 00:02:15.320 --> 00:02:19.480 Compared to standard reconnection that occurs over tens of thousands of miles, 33 00:02:19.500 --> 00:02:24.450 this new magnetic reconnection spans only a couple of miles within turbulent plasma. 34 00:02:24.470 --> 00:02:29.600 These reactions are essentially much smaller but more stretchy elastic bands 35 00:02:29.620 --> 00:02:32.360 that accelerate particles 40 times faster. 36 00:02:32.380 --> 00:02:38.830 In short, MMS spotted a completely new magnetic mechanism that’s much quicker than what we’ve seen before. 37 00:02:38.850 --> 00:02:41.170 Just like when you mix milk into coffee, 38 00:02:41.190 --> 00:02:45.670 turbulent plasma in space moves randomly and creates vortices. 39 00:02:45.690 --> 00:02:52.280 It can transport particles and energy, but a lot is unknown about how these particles move through these regions. 40 00:02:52.300 --> 00:02:56.860 Showing that this new magnetic reconnection plays a role in turbulent plasma 41 00:02:56.880 --> 00:03:02.210 gives scientists insights into how turbulence influences particles moving through space. 42 00:03:02.230 --> 00:03:07.340 By looking at such fundamental processes in space at both large and small scales, 43 00:03:07.360 --> 00:03:11.400 scientists can learn what drives the complex environment we travel through 44 00:03:11.420 --> 00:03:14.640 to explore our solar system and beyond. 45 00:03:14.660 --> 00:03:23.550