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| In this system, Earth is at the center. |
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| In this system, the sun is at the center. |
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| An oval shape which may be elongated or nearly circular. |
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| the central region of the sun, the center. |
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| Hydrogen atoms join together to form helium. |
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| A region of very tightly packed gas where energy is transferred mainly in the form of light radiation. |
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| The outermost layer of the sun's interior. |
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| The inner layer of the sun's atmosphere. |
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| The middle layer of the sun's atmosphere. |
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| The outer layer or halo of the sun, means "crown". |
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| Streams of electrically charged particles. |
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| Areas of gas on the sun's surface that are cooler than the gases around them. |
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| Huge, reddish loops of gas. |
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| Eruption of gas from the sun's surface. |
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| The name often given to the four innner planets: Mercury, Venus, Earth and Mars. |
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| The trapping of heat by a planet's atmosphere. |
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| The name often given to the four outer planets: Jupiter, Saturn, Uranus and Neptune. |
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| A thin disk of small ice and rock particles surrounding a planet. |
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| A loose collection of ice, dust and small rocky particles, typically with a long narrow orbit. |
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| The fuzzy outer layer of a comet. |
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| The solid inner core of a comet. |
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| A doughnut shaped region that stretches from around Pluto's orbit to about 100 times Earth's distance from the sun. |
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| A spherical region of comets that surrounds the solar system. |
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| Rocky objects revolving around the sun that are to small and numerous to be considered planets. |
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| The region of the solar system between the orbits of Mars and Jupiter where many asteroids are found. |
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| A chunk of rock or dust in space. |
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| A streak of light in the sky produced by the burning of a meteoroid in Earth's atmosphere. |
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| A meteorite that passes throught the atmosphere and hits Earth's surface. |
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| Life that exists other than that on Earth. |
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| The Greeks were the first to notices that some objects do move in the sky. What did they call those objects? |
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| Planets which means Wanderer. |
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| What is the name of the Greek Astronomer that modified the geocentric model and said that the planets moved on small circles? |
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| Polish astronomer that solidified the heliocentric model by working out the arrangement of the known planets and their movement around the sun. |
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| Who is the Danish Astronomer that observed the sky, without a telescope, for 20 years to record the movement of the planets? |
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| What astronomer determined that the planets move along orbits in the shape of an ellipse. |
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| Name other types of objects which revolve around the sun. |
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| The further a planet is from the sun what happens to the speed of the planet? |
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| The speed of the planet slows down. |
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| The sun makes up what % of the solar systems mass? |
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| What is the sun composed of ? |
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| 3/4 Hydrogen and 1/4 Helium |
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| Name the three parts of the sun. |
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| Core, the radiation zone, and the convection zone. |
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| The temperature of the sun's core is? |
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| 15 million degrees Celsius or 27 million degrees Fahrenheit. |
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| Nuclear fusion occurs only under what condition? |
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| How many years does it take for energy to pass through this very dense region. |
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| Solar flares ___________the solar wind emanating from the sun's corona. |
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| The Earth has three main layers. What are they? |
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| The Earth is unique in our solar system in having what on its surface? |
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| The Earths surface is 70% water. |
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| Another unique fact about the Earth is? |
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| Earth has an atmosphere with 21% oxygen. |
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| Which planet is closest to the sun? |
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| Which planet is known as the "morning" or "evening" star? |
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| Venus atmosphere has alot of what gas that causes the surface temperature to average 460 |
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| Venus atmosphere has alot of what gas that causes the surface temperature to average 460 degrees? |
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| Which planet is known as the iron planet due to the iron oxide in the dust? |
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| True or False. Is there ice on Mars? |
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| The outer planets are known as? |
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| Which planet has four moons that are as big as the Earth? |
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| What is the planet that has a mass 2 1/2 times that of all the other planets combined? |
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| What is the planet that has rings composed of ice and rock? |
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| Saturns moon, Enceladus, has dramatic plumes of what? |
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| What planet is tilted 90% on its axis? |
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| What planet is cold and blue and also has 13 moons. |
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| what planet is the smallest and has a solid surface and is much denser than other planets? |
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