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The Solar System

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What is the Solar System?

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Earth is the only planet on which we know that there have been plants and animals living. On some planets there is no air to breathe and on others it is either too hot or too cold. Some scientists think that creatures may have lived on Mars millions of years ago, when Mars was warmer and had more air — they try to find evidence to show this is true.

Until , people thought that there were nine planets in the Solar System. The ninth planet was Pluto and it is even further away from the Sun than Neptune. Astronomers decided that Pluto was too small to be called a planet, so now there are only eight planets. The Sun is a star, it is a huge ball of very hot gas.

The Sun is about 4. There are more than billion stars in the Milky Way and there are many different types of star. Scientists group stars together by how big they are and how bright they are.

Some examples are red dwarfs and supergiants. A red dwarf is a star about half the size of the Sun and a lot less bright than the Sun. A supergiant star is about 70 times as big as the Sun and can be , times as bright. It is red dwarf that is smaller and colder than our Sun and gives off a lot less light.

Even though it is the closest star outside the Solar System, the light from it is too faint to see except with a telescope. Proxima Centuri is 24 trillion miles from Earth and light from it takes four years and three months to reach Earth. Mercury — this is the closest planet to the Sun. It is the smallest planet and is made of rock.

It is so close to the Sun that it only takes 88 days for it to complete its orbit and is much hotter than Earth. Venus — Venus is the next planet from the Sun after Mercury. It is also made of rock. It is about the same size as Earth.

It takes days to travel around the Sun. Earth — This is where we live! Earth is made of rock and is the only planet where water is liquid. The other planets are either too hot or too cold. Earth takes days to travel around the Sun. Mars — Mars is a little smaller than Earth, but a lot further out. Jupiter — Jupiter is the largest planet in the Solar System.

Jupiter has 66 moons, one of them, Ganymede, is bigger than Mercury. Jupiter is five times as far from the Sun as the Earth is and takes almost 12 years to travel around the Sun.

Saturn — Saturn is famous for its rings. The rings were discovered in by Galileo and are made up of huge numbers of small lumps of ice and dust mostly ice. The pieces in the rings may be as small as a millimetre or as large as a few metres across. You could fit 63 planets the size of Earth inside Uranus.

Neptune — Neptune is the farthest planet from the Sun. It is 30 times as far from the sun as Earth and takes years to travel around the Sun. Asteroid — Asteroids are bodies of rock and ice in space. Millions of asteroids orbit the Sun -most between Mars and Jupiter. They vary in size between 1 metre across and miles across. Atmosphere — the layer of gas around a planet Comet — a comet is a body of ice, dust and bits of rock that passes through space leaving a tail of ice and dust behind it.

A comet may be up to 25 miles across. Day — the length of time it takes the Earth to spin all the way around so that you get a night and a day — 24 hours Galaxy — a large group of stars, all orbiting a central point. Gravity — the force that attracts a moon to a planet, or a planet to a star Light Year — the distance that light travels in one year. Some planets have many moons. Earth has just one, called The Moon. Solar System — the Sun and the collection of stars Star — A star is a huge ball of very hot gases, that gives off lots of light and heat.

Some stars have planets orbiting around them, but not all do. Sun — the star in our Solar System Universe — The Universe is everything that exists — all the galaxies, all the stars, all the planets and everything in between Year — the length of time it takes the Earth to travel around the Sun — days. Access thousands of brilliant resources to help your child be the best they can be. What is the Solar System? Everything in the Solar System revolves around the Sun. The Sun is a star — a massive ball of hot gas that gives off light and heat.

Now imagine yourself living on Mars. The answer is C Once every 2. How many planets are there in the solar system? Currently, there are officially eight planets in our solar system. How does the almost closed nature of Earth's system affect the abundance of natural resources The Earth exists within its own unique atmosphere -- an atmosphere essential for the existence of life as we know it.

It is entirely unique not just within the Solar System, but, until scientific What are some of the main differences between the Earth-like planets and the giant outer planets The planets in our solar system can be divided into two groups, the inner planets of Mars, Earth, Venus and Mercury and the outer, Jovian one of Jupiter, Saturn, Neptune, and Uranus. Our data has improved considerably in the last 20 years.

When considering only the Sun, Earth, Mercury, and Mars in a planetary system, which statement is

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The Solar System includes the Sun, the Earth (where you are standing now!) and all of the other planets, asteroids and comets that go around and around it. You may think that .

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What is the name of the galaxy that our solar system is in? The name of our galaxy is the Milky Way. Our solar system is located in the outer reaches of the Milky Way Galaxy. All of the stars that you see at night and our Sun belong to the Milky Way.

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The Earth in the Solar System chapter of this Middle School Physical Science Homework Help course helps students complete their Earth in the solar system homework and earn better grades. This homework help resource uses simple and fun videos that are about five minutes long. Solar System Questions and Answers - Discover the community of teachers, mentors and students just like you that can answer any question you might have on Solar System.

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As a result of discoveries made by the New Horizons mission and other observations, the new solar system may have many more planets than the accepted eight or nine. The new solar system may have hundreds of planets, including asteroids, moons, and . – The planets in our solar system are separated into three general groups: the “ Inner planets,” the “ Outer planets,” and the “ Dwarf Planets.” THE INNER PLANETS – The inner planets include Mercury, Venus, Earth, and Mars.