1 00:00:01,110 --> 00:00:05,110 Welcome to the next video about our beloved star, the Sun. 2 00:00:05,110 --> 00:00:11,109 We are a team of scientists and engineers who study the stars and outer space. 3 00:00:11,109 --> 00:00:18,109 Have you ever wondered how the stars are born, or how then our Sun will die? 4 00:00:18,109 --> 00:00:20,109 Or even, does the Sun rotate? 5 00:00:20,109 --> 00:00:26,109 If that is the case, then keep watching to see the answers of my teammates. 6 00:00:26,109 --> 00:00:33,109 Hi! We are Erika, Kike and me, Akram, and we are going to show you how the Sun evolved during its life. 7 00:00:33,109 --> 00:00:40,109 At the very beginning, about 5 billion years ago, our star was just a large cloud of gas and dirt with many different colors, 8 00:00:40,109 --> 00:00:43,109 called stellar nebula, just like confetti. 9 00:00:43,109 --> 00:00:48,109 Then it began to shrink and its density increased, forming a baby Sun. 10 00:00:48,109 --> 00:00:55,109 Observing other stars with similar sizes, astronomers have been able to say how it will evolve during the following billions of years. 11 00:00:55,109 --> 00:01:01,530 of years that's right and don't worry the Sun won't die in the near future and 12 00:01:01,530 --> 00:01:07,469 we won't be able to see it as it will happen in another five billion years but 13 00:01:07,469 --> 00:01:14,849 before its death it will grow and grow and grow to become a red giant and it 14 00:01:14,849 --> 00:01:20,230 will engulf Mercury and Venus and perhaps Earth then it will start to 15 00:01:20,230 --> 00:01:28,109 shrink again and when it fades away it will become a small white dwarf. There 16 00:01:28,109 --> 00:01:34,109 won't be any explosions or supernovas? I'm sorry but that will never happen to 17 00:01:34,109 --> 00:01:39,909 our Sun. It's way too small to become a black hole like many people may think. 18 00:01:39,909 --> 00:01:45,010 Now I guess you want to see some experiments right? Well Kike will show 19 00:01:45,010 --> 00:01:48,730 you how to represent the life of the Sun in just two easy experiments. The first 20 00:01:48,730 --> 00:01:54,730 In the next experiments we will show you how the atoms are expelled from the star throughout its life cycle. 21 00:01:55,730 --> 00:02:00,730 To do so, we will hold a tennis ball on a basketball and let them fall. 22 00:02:01,730 --> 00:02:04,730 The tennis ball will be launched into the air really fast. 23 00:02:05,730 --> 00:02:10,729 To try it, our second experiment consists of showing how the sun will die. 24 00:02:11,729 --> 00:02:14,729 We will represent the sun with a balloon full of color powder. 25 00:02:14,729 --> 00:02:20,349 We need to inflate the balloon as much as we can and then pop it. 26 00:02:20,930 --> 00:02:26,870 This is the form of a cloud of colors called the planetary nebula. 27 00:02:27,629 --> 00:02:32,849 And that is the way that a normal star will die, but our sun, no. 28 00:02:33,370 --> 00:02:34,969 That sounds really nice. 29 00:02:35,550 --> 00:02:40,969 You've explained everything about the sun's life cycle, but we don't know yet if it rotates. 30 00:02:40,969 --> 00:02:42,569 Can you tell us, Diego? 31 00:02:42,569 --> 00:02:54,460 Yes, the Sun rotates, indeed, but not like our parent does. The Sun is made of plasma and there is no soil to hold it together. 32 00:02:54,460 --> 00:02:59,460 Therefore, the Earth's middle equator rotates faster than the one at the poles. 33 00:02:59,460 --> 00:03:03,460 Interesting, but how can we know that? 34 00:03:03,460 --> 00:03:08,460 By comparing the latitudes and longitudes of a sunspot during a period of time. 35 00:03:08,460 --> 00:03:16,460 This way, we know the speed at which it is moving, and we can calculate the Euler's rotational period and the differential rotation. 36 00:03:17,460 --> 00:03:21,460 And why did you all decide to talk about these two topics? 37 00:03:21,460 --> 00:03:27,460 We thought it was important that everyone knew that the Sun was an average star, which won't die as a supernova, 38 00:03:27,460 --> 00:03:33,460 or that it doesn't rotate at the same speed as Euler's old RS. 39 00:03:33,460 --> 00:03:42,460 The Sun is, after all, our nearest star, and it would so learn as much as possible we could about it. 40 00:03:42,460 --> 00:03:49,460 And you? Do you think it's important to know a lot of information about the universe outside our world? 41 00:03:49,460 --> 00:03:58,460 We hope you have enjoyed the video and that it has inspired you to share some more about the Sun. Goodbye!