Our Solar System

1. Our Solar System Our Solar System National College Iasi

2. Our Planets • Sun • Mercury • Venus • Earth • Earth`s Moon • Mars • Jupiter • Saturn • Uranus • Neptune • Pluto • Others • Asteroids • Meteor and Meteorites • Comets National College Iasi

3. Sun • The Sun is the star at the center of the Solar System • The Sun's color is white, although from the surface of the Earth it may appear yellow because of atmospheric scattering of blue light • The sun is made up entirely of gase light • The sun, like Earth, is magnetic • The sun was born about 4.6 billion years ago • The inside of the sun and most of its atmosphere consist of plasma National College Iasi

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5. Mercury • Mercury has very little atmosphere to stop impacts • it is covered with craters • Mercury’s surface is overall very similar in appearance to that of the Moon • The orbit of Mercury has the highest eccentricity of all the Solar System planets National College Iasi

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7. Venus • is the brightest of the planets known to the ancients • it shows phases when viewed with a telescope from the perspective of Earth • Venus is only slightly smaller than Earth • There are no small craters on Venus • Venus is now quite dry • Venus has no magnetic field, perhaps because of its slow rotation. • Venus has no satellites National College Iasi

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9. Earth • is the third planet from the Sunand the densest and fifth-largest of the eight planets in the Solar System • Home to millions of species including humans, Earth is currently the only place where life is known to exist • Earth's outer surface is divided into several rigid segments • Earth interacts with other objects in space, especially the Sun and the Moon • The planet is expected to continue supporting life for at least another 500 million years National College Iasi

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11. Earth`s Moon • It is the second brightest object in the sky after the Sun • The Moon was first visited by the Soviet spacecraft Luna 2 in 1959 • there is no "dark side" of the Moon • The Moon has no atmosphere • Most rocks on the surface of the Moon seem to be between 4.6 and 3 billion years old • The Moon has no global magnetic field • With no atmosphere and no magnetic field, the Moon's surface is exposed directly to the solar wind National College Iasi

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13. Mars • is smaller than Earth and Venus • It possesses an atmosphere of mostly carbon dioxide • Its surface, shows geological activity that may have persisted until as recently as 2 million years ago • Its red colour comes from iron oxide in its soil National College Iasi

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15. Jupiter • is 2.5 times the mass of all the other planets put together • It is composed largely of hydrogen and helium • Jupiter has 63 known satellites • Ganymede, the largest satellite in the Solar System, is larger than Mercury National College Iasi

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17. Saturn • Saturn distinguished by its extensive ring system • Saturn has 60% of Jupiter's volume • The rings of Saturn are made up of small ice and rock particles • Saturn has 62 confirmed satellites National College Iasi

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19. Uranus • is the lightest of the outer planets • Uniquely among the planets, it orbits the Sun on its side • It has a much colder core than the other gas giants • radiates very little heat into space • Uranus has 27 known satellites National College Iasi

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21. Neptune • Neptune, though slightly smaller than Uranus, is more massive and therefore more dense • It radiates more internal heat, but not as much as Jupiter or Saturn • Neptune has 13 known satellites • is accompanied in its orbit by a number of minor planets, termed Neptune Trojans National College Iasi

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23. Pluto • is the second most massive known dwarf planet in the Solar System • is now considered the largest member of a distinct population known as the Kuiper belt • is composed primarily of rock and ice and is relatively small • Pluto and its largest moon, Charon, are sometimes treated as a binary system because the barycentre of their orbits does not lie within either body • has two known smaller moons, Nix and Hydra National College Iasi

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25. Ptolemy's "planetary spheres”" National College Iasi

26. Asteroids • Asteroids are mostly small Solar System bodies composed mainly of refractory rocky and metallic minerals • The main asteroid belt occupies the orbit between Mars and Jupiter • Asteroids range in size from hundreds of kilometres across to microscopic • The asteroid belt contains tens of thousands, possibly millions, of objects over one kilometre in diameter National College Iasi

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28. Meteor and Meteorites • A meteorite is a natural object originating in outer space that survives impact with the Earth's surface • Meteorites can be big or small • have been found on the Moon and Mars • are always named for the place where they were found, usually a nearby town or geographic feature National College Iasi

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30. Comets • Comets are small Solar System bodies, typically only a few kilometres across, composed largely of volatile ices • They have highly eccentric orbits • Short-period comets have orbits lasting less than two hundred years • Long-period comets have orbits lasting thousands of years • Old comets that have had most of their volatiles driven out by solar warming are often categorised as asteroids National College Iasi

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32. Attractions! Black Hole click here for details http://www.nasa.gov/multimedia/videogallery/index.html National College Iasi

33. The End! Scarlat Ioana Bianca Cojocariu Diana National College Iasi