About our solar system - planets

Lesson 1: Why is the interior of the Earth hot? The interior of Earth is very hot (the temperature of the core reaches more than 5,000 degrees Celsius) for two main reasons: . The heat from when the planet formed, . The heat from the decay of radioactive elements. The Earth was formed by the process of accretion. After the creation of our solar system, meteorites gravitationally attracted each other and formed bigger objects, which attracted bigger masses, until our planets reach their current size. This process accumulated a lot of heat; when two objects collide, heat is generated. That is why your hands will get hot when you clap them for too long, or a nail gets very hot when you hammer it for a long time. This heat has not dissipated totally and represents about 10% of the total heat inside the Earth. The main source of heat is the decay of radioactive elements. Radioactive decay is a natural process; unstable elements like 238U (Uranium) or 40K (Potassium) stabilize with time and produce what we call daughter products: 206P (Lead) for Uranium and 40Ar (Argon) for Potassium. This process produces heat, which represents about 90% of the total heat inside the Earth. Lesson 2: How Magma Forms Magma is a molten and semi-molten rock mixture found under the surface of the Earth. This mixture is usually made up the of four parts: hot liquid base, called a melt; minerals crystallized by the melt; solid rocks incorporated into the melt from the surrounding confines; and dissolved gases. When magma is ejected by a volcano or other vent, the material is called lava. Magma that has cooled into a solid is

THE SOAR SYSTEM A solar system is a group of planets and other celestial bodies that revolve around a star. A solar nebula- a vast cloud of gas and dust, mostly hydrogen and helium. How the Solar System Form • COLLAPSE AND SPINNING DISK FORMATION - Gravity pulls material inward. The cloud flattens into a spinning disk due to conservation of angular momentum. • PROTOSTAR FORMATION- (BIRTH OF THE SUN). Material collects at the center, and begun to heat up. When it reaches to 10 million KELVIN, nuclear fusion begins. thus, SUN is born. • PLANETESIMALS AND PROTOPLANETS. Dust and gas in the disk stick together via static and gravitational forces. These form planetesimals, which grow into protoplanets collision and accretion. • PLANET FORMATION. Inner disk: too hot for gas rocky planets form Mercury, Venus, Earth, Mars. • PLANET FORMATION. Outer disk: gas and ice giants. Jupiter, Saturn, Uranus, Neptune • LEFTOVER DEBRIS. Remaining materials forms moon, asteroids, comets and dwarf planets. DIFFERENT HYPOTHESIS IN THE FORMATION OF SOLAR SYSTEM. 1. NEBULAR HYPOTHESIS- The Solar system formed from a rotating cloud of Gas and Dust (solar nebula). As it rotates conservation of angular momentum caused the cloud to flatten into a disk. the Sun formed at the center (DISK) while planets formed from the surrounding materials through acceleration. thus, it explains the coplanar and nearly circular orbit of the planets all planets orbits around the sun on the same flat, disk shaped plane. Proposed by Immanuel Kant in 1755 and Modified by Pierre Simon Laplace in 1756. PROTOPLANET HYPOTHESIS. The Solar system formed from a rotating cloud of Gas and Dust (solar nebula). As it rotates conservation of angular momentum caused the cloud to flatten into a disk. 2. Protoplanet hypothesis. Builds on the nebular model but focuses more on the role of planetesimals which then form into full planets. PROCESS: - Small solid particles stick together through collisions. As collisions takes place, it grows into kilometer-sized planetesimals. Gravitational interactions lead to the formation of planets. Lead to formation of steroids belts and varying planet sizes 3. Encounter hypothesis. States that the sun encountered a rogue star. The encounter led to the removal of hot gas from both stars due to their gravitational interaction. The hot gas then accumulated and formed the planets. The materials from the less dense rogue star formed the other planets, while that from the sun formed the inner planets. 4. TIDAL HYPOTHESIS. (also called the Tidal Theory) is an early scientific idea about how the solar system might have formed. Proposed by James Jeans and Harold Jeffreys. A massive star passed very close to the early Sun. The hot gas then accumulated and formed the planets. The materials from the less dense rogue star formed the other planets, while that from the sun formed the inner planets. Streams of hot gas were drawn out from the Sun in elongated shape. These streams eventually condensed and cooled, forming planets, moons, and other bodies in the solar system. 5. Not accepted theory. Later studies showed the streams of hot gas would disperse too quickly into space instead of condensing into planets. The theory also couldn’t explain the specific orbital patterns and compositions we see today. Modern science favors the Nebular Hypothesis, which explains solar system formation through the collapse of a rotating gas cloud. Earth as the only habitable planet 1. Right Distance from the Sun (The Goldilocks Zone). Not too hot, not too cold — just right for liquid water to exist. 2. Atmosphere with Oxygen. Earth has a mix of gases, especially oxygen, which most living things need to survive. 3. Liquid Water. Earth has oceans, rivers, and rain — water is essential for all life. 4. Magnetic Field. Earth’s magnetic field protects us from harmful solar radiation. 5. Stable Climate. The atmosphere and natural cycles keep temperatures and weather mostly stable over time. 6. Rich Resources. Earth has soil for growing food, minerals, and energy sources that support life and technology. Solar explorations 1. AUGUST 6, 2014. First space craft to orbit a comet (ROSETTA PROBE). Captures the comet photograph. -Comets have coma and tail as it approaches to the sun. 2. JULY 14, 2015. NASA’s New Horizons spacecraft made history by becoming the first spacecraft to fly by Pluto, giving us our first close-up look at the dwarf planet. First time visiting Pluto. Before this, Pluto was just a blurry dot in telescope images. Revealed a surprising world New Horizons showed mountains of ice, smooth plains, and a heart-shaped region called Tombaugh Regio. Changed what we knew. Scientists thought Pluto would be dull and frozen — instead, it turned out to be geologically active and incredibly complex. 3. SEPTEMBER 8, 2016. NASA launched OSIRIS-REx, the first U.S. mission to collect a sample from an asteroid and return it to Earth. Changed what we knew. Scientists thought Pluto would be dull and frozen — instead, it turned out to be geologically active and incredibly complex. OSIRIS-REx stands for: Origins, Spectral Interpretation, Resource Identification, Security–Regolith Explorer It was sent to study the asteroid Bennu, a near-Earth asteroid about 500 meters wide. Mission Goals: Collect a sample of surface material from Bennu Study the asteroid’s omposition, structure, and history. Mission Goals: Help scientists understand the origins of the solar system. Learn more about asteroids that could impact Earth. 4. August 12, 2018: Launch of NASA’s Parker Solar Probe, the first spacecraft to "touch" the Sun by flying through its outer atmosphere, called the corona. Mission Goal: To study the Sun up close and help scientists understand: How the solar wind (a stream of charged particles) is formed. Why the Sun’s corona is hotter than its surface. What causes solar storms that can affect Earth’s satellites and power grids. 5. November 26, 2018: NASA’s Insight Lander Touches Down on Mars. Its mission was focused on studying the interior of the Red Planet (crust, mantle, and core of the planet). Why the Sun’s corona is hotter than its surface. What causes solar storms that can affect Earth’s satellites and power grids 6. November 26, 2018: NASA’s Insight Lander Touches Down on Mars. Its mission was focused on studying the interior of the Red Planet (crust, mantle, and core of the planet) 7. JULY 30, 2020 PERSEVERANCE PROBE. Perseverance rover as part of the Mars 2020 mission aboard an Atlas V-541 rocket This marked a major step in Mars exploration. 8. DECEMBER 25, 2021-JAMES WEBB SPACE TELESCOPE. Investigate exoplanets’ atmospheres for signs of habitability. Observe the first galaxies formed after the Big Bang. Study the formation of stars and planetary systems. Look deeper into the infrared universe than ever before. RESULTS OF EXPLORATION • Evidence of Ancient Life-friendly Environment. • Sedimentary rocks formed in water-rich environments. • Signs of clay and carbonate minerals, which can preserve biosignatures (traces of past life). • Evidence of Ancient Life-friendly Environment. • Sedimentary rocks formed in water-rich environments. • Signs of clay and carbonate minerals, which can preserve biosignatures (traces of past life). • Evidence of Ancient Life-friendly Environment. • Sedimentary rocks formed in water-rich environments. • Signs of clay and carbonate minerals, which can preserve biosignatures (traces of past life).

Reinforcement Quiz 5ª Something about our solar system

Awesome Quiz About Our Solar System

There are two numbers you need to know about climate change. The first is 51 billion. The other is zero. Fifty-one billion is how many tons of greenhouse gases the world typically adds to the atmosphere every year. This is where we are today. Zero is what we need to aim for. To stop the warming and avoid the worst effects of climate change, humans need to stop adding greenhouse gases to the atmosphere. This sounds difficult, because it will be. Every country will need to change its ways. Virtually every activity in modern life – growing things, making things, getting around from place to place – involves releasing greenhouse gases, and as time goes on, more people will be living this modern lifestyle. That’s good, because it means their lives are getting better. Yet if nothing else changes, the world will keep producing greenhouse gases, climate change will keep getting worse, and the impact on humans will be catastrophic. But “if nothing else changes” is a big If. I believe that things can change. We already have some of the tools we need, and as for those we don’t yet have, we can not only invent, but also deploy them, and, if we act fast enough, avoid a climate catastrophe. Two decades ago, I would never have predicted that one day I would be talking in public about climate change. My background is in software, not climate science. Things changed for me when I met with two former Microsoft colleagues who were starting non-profits focused on energy and climate. They brought along two climate experts who were well versed in the issues, and the four of them showed me the data connecting greenhouse gas emissions to climate change. I kept learning everything I could about climate and energy, agriculture, oceans, sea levels, glaciers, power lines, and more. One thing that became clear to me was that our current sources of renewable energy – wind and solar, mostly – could make a big dent in the problem, but we weren’t doing enough to deploy them. It also became clear why, on their own, they aren’t enough to get us all the way to zero. The wind doesn’t always blow and the sun doesn’t always shine. Within a few years, I had become convinced of three things: 1. To avoid a climate disaster, we have to get to zero. 2. We need to deploy the tools we already have, like solar and wind, faster and smarter. 3. We need to create breakthrough technologies that can take us the rest of the way.

A Choose the correct answer. 1 When his grandma died, he came ….. some of her money and property. A into C across B up D round 2 We should try to ….. the amount of rubbish in our area. A increase C provide B improve D reduce 3 I avoid driving to work because there are always ….. jams in the centre. A transport C power B traffic D station 4 By the end of the year, there will be more ….. farms in our city. A solar C floating B vertical D electric 5 Who is going to ….. our new piano? A deal C deliver B produce D construct 6 She doesn’t like being ….. in the house; she wants people around her. A healthy C lonely B crowded D alone 7 Why don’t you come ….. for dinner tonight? A up C over B into D back 8 Mr Jones has found the cure for a serious ….. . A disease C crime B pollution D poverty 9 Scientists are hopeful ….. the future of energy sources. A for C about B in D with 10 Do you think ….. tube trains will ever be used? A drone C charging B front D vacuum Grammar B Choose the correct answer. 1 I’ll still ….. two hours from now. A have gardened C garden B have gardening D be gardening 2 ….. you ….. your homework by 7 o’clock? A Will ... finish C Will … have finished B Will … be finishing D Won’t … finish 3 By 2100, experts ….. new energy sources. A will have discovered C will be discovering B will be discovered D will discover 4 The film will have started before we ….. there. A will have got C get B will get D will be getting 5 This time tomorrow, Sheila ….. a job interview. A will have C will be having B is having D will have had 6 David ..... back from work by dinner time. A will be coming C will have come B will come D won’t be coming 7 I can’t believe that in a few hours, we ….. our first live concert. A are performing C will have performed B will be performing D will perform 8 ….. next Friday, I will be flying to Glasgow. A This time C By B At D Until 9 Jake ….. by the end of September. A will retire C will have retired B is retiring D will be retiring 10 ….. the time Mum gets home, I will have tidied my room. A Before C Until B At D By Everyday English C Choose the correct answer. 1 A: How did you find that job? B: a I’ll be working in the local library. b I’ll be there from June 15th. c There was an advert online. 2 A: I can’t wait! B: a Sounds like fun. b I’ll work in my uncle’s restaurant. c I’ll stay there for two weeks. 3 A: Do you have any plans for the summer? B: a Really? b What about you? c Haven’t I told you? 4 A: What will your duties be? B: a I’ll be flying to London to see my uncle. b I’ll be helping customers. c I’ll have earned enough money to buy a new smartphone. 5 A: How long will you stay there? B: a Until the end of July. b Well, this time next week, I’ll be relaxing. c And what are your plans?

Welcome, Carlos! One late summer day, Carlos sat at the kitchen table. He wanted to begin his poster. He had found paper, glue, and colored markers. He had a box of family photoS. But what should I put on it? he thought. Soon, Carlos would start school in a new town, in a new country. He had just met his new school principal. "You can bring this poster on the first day of school, Carlos," his principal had said. "This will help the kids get to know you." Carlos picked photos of his family. He added one of their old home in Monterrey, Mexico. He wrote about the books, sports, and foods he liked. He carried his poster across the hall of his apartment building. He knocked on the door, and a smiling girl opened it. "Hola, Carlos!" said Maria. "Hola, Maria," said Carlos. "Do you want to see my poster? It's for the first day of school." "Oh, yes!" said Maria. Carlos spread out the poster. "This is a photo of my parents," Carlos explained. "This is our house. These are the mountains in Monterrey." "My padre works for a big solar energy company from Monterrey. They moved us to the United States to open a new factory here." "Monterrey looks beautiful, Carlos," said Maria. "It was sunny and a great place to do things outdoors," Carlos said. "Was it hard to leave your relatives?" Maria asked. "Yes, but we'll go back during the holidays to visit them," said Carlos. Maria looked at another photo. "That's my older brother, Mateo. This is my little sister, Selena," Carlos said. "My abuela will come to live with us soon, too." Maria read that Carlos liked to play baseball. "You could join our baseball team!" said Maria. "That would be fun," said Carlos. He showed Maria his best batting swing. "That's a good hit, for sure!" laughed Maria. Then Maria brought out crayons and markers. Together they colored the rest of the poster. "There's something I want to add," said Carlos. Carlos drew a picture of a smiling girl. She had long, soft hair. "Is that your friend in Monterrey?" asked Maria. "No, it's my first friend in America!" said Carlos.

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