WEBVTT 00:00:02.520 --> 00:00:04.000 [INTRO MUSIC ] 00:00:10.120 --> 00:00:18.980 Pop quiz: what's the closest star to Earth? it is the sun also known as sol 00:00:18.980 --> 00:00:22.480 Ancient Romans – who once worshipped the Sun – called it Sol 00:00:22.480 --> 00:00:25.760 and it's become the kind of official scientific name for the Sun. 00:00:25.760 --> 00:00:28.740 It's where the term 'solar system' comes from. 00:00:28.740 --> 00:00:35.300 Sol, or the Sun, is the star at the center of our eight-planet solar system that provides us with energy. 00:00:35.300 --> 00:00:40.160 Without the Sun, Earth would be a dark, frozen world with no life. 00:00:40.160 --> 00:00:42.480 But how does the Sun's energy get to us? 00:00:46.680 --> 00:00:49.380 Well, first, let's talk about what the Sun is. 00:00:49.380 --> 00:00:53.800 It's a five billion-year-old big ball of super hot gas. 00:00:53.800 --> 00:01:01.660 The hottest part of the Sun is its core, or center, which is about 15,000,000°C! 00:01:01.660 --> 00:01:02.520 Woah! 00:01:02.520 --> 00:01:08.500 Its surface is not quite as hot, but it's still almost 5,600°C, 00:01:08.500 --> 00:01:10.180 which is pretty toasty if you ask me! 00:01:10.180 --> 00:01:11.820 And as for its size? 00:01:11.820 --> 00:01:17.400 The Sun is so huge you can line up over a hundred Earths along the face of it, 00:01:17.400 --> 00:01:21.140 and more than a million Earths could fit inside it. 00:01:21.140 --> 00:01:24.660 But the Sun's size isn't what makes it seem so big and bright to us on Earth – 00:01:24.660 --> 00:01:29.180 it's because it's so close to us that it seems way, way, way, WAY bigger 00:01:29.180 --> 00:01:31.220 and brighter than other stars. 00:01:31.220 --> 00:01:34.460 So, you know that the Sun is hot. And bright. 00:01:34.460 --> 00:01:37.980 And that heat and light are both kinds of energy that we get from the Sun. 00:01:37.980 --> 00:01:42.700 Let's take a look at a model to see how the Sun's energy gets from good ol' Sol to our planet. 00:01:46.560 --> 00:01:47.700 Here's the Sun. 00:01:47.700 --> 00:01:52.460 Energy is created in its super hot 15,000,000°C core. 00:01:52.460 --> 00:01:56.760 That energy then travels outward from the core to the surface of the Sun, 00:01:56.760 --> 00:02:03.500 but this journey from the center of the Sun to its surface can take over 100,000 years to complete. 00:02:03.500 --> 00:02:07.920 But, once the energy deep inside the Sun finally gets to the surface, 00:02:07.920 --> 00:02:11.140 it travels as light and heat all the way to Earth. 00:02:11.140 --> 00:02:18.280 In fact, it only takes about eight minutes for light to travel approximately 150 million km 00:02:18.280 --> 00:02:20.800 through space to Earth over here. 00:02:20.800 --> 00:02:22.900 That's not such a long time! 00:02:26.700 --> 00:02:30.000 So to sum up, energy is created in the Sun's core. 00:02:30.000 --> 00:02:33.240 It travels very slowly to the Sun's surface, 00:02:33.240 --> 00:02:37.460 before it takes a superspeedy trip to Earth in the form of light and heat. 00:02:37.460 --> 00:02:41.060 And you and I can see and feel that energy as sunlight. 00:02:41.060 --> 00:02:46.900 Without the heat and light we get from the Sun, Earth would be just a frozen ball floating around in space, 00:02:46.900 --> 00:02:49.800 which would be a total bummer! 00:02:49.800 --> 00:02:53.380 So, thanks Sol, you're a real star! 00:02:53.380 --> 00:02:54.840 [OUTRO MUSIC]