1.THE EARTH AND THE SOLAR SYSTEM THE UNIVERSE
UNIVERSE:
1. it’s made up of all astronomical objetcs in space. 2. It was formed about 14 billion years ago 3. Big bang was a gigantic explosion that proppelled matter and energy and create galaxies.
• GALAXIES: Groups of stars. • STARS: Astronomical objets that release energy in form of light and heat.
• MILKY WAY: Is our galaxy.
1.THE EARTH AND THE SOLAR SYSTEM THE SOLAR SYSTEM SOLAR SYSTEM: Is made up of the SUN, the PLANETS and SATELLITES (Planets and satellites orbit around the Sun). SUN: 1. It’s a star, it has medium size (it’s in the Milky Way) 2. It’s made up of gases. 3. Inside it, there are nuclear reaction that release light and heat. PLANETS: 1. Spherical bodies that don’t release their own light. 2. they orbit the Sun, their orbit is elliptical (not round) SATELLITES: 1. solid bodies that orbt the planets. 2. They don’t release their own light. MOON: The Earth’s satellite. OTHER OBJECTS: 1. ASTEROIDS: Solid rocks that orbit the Sun. 2. COMETS: Giant balls of cosmic dust and ice. They melt when they pass close to the Sun 3. METEORS: Small objects that burn when they enter in the Earth’s atmosphere.
1.THE EARTH AND THE SOLAR SYSTEM THE EARTH -
it’s a planet in the Solar System that orbit the Sun It has a satellite: the Moon It doesn’t release its own light. - it was formed around 4.6 billion years ago. It’s the only planet in the Solar System where life exists, because 3 main reasons: 1. It has rigth temperature : it isn´t too hot, it isn’t too cold. 2. It has an atmosphere: which is a layer of gases (one of them oxigen) that protects the Eart from harmful radiation (ultraviolet light). 3. It has a liquid water (essential for living things)
1.THE EARTH AND THE SOLAR SYSTEM SHAPE AND DIMENSIONS OF THE EARTH SHAPE: - The Earth is a sphere, but not perfect. - It’s widest at the equator - It’s flattened at the poles. - As a consequence, the polar diameter is smaller than the equatorial diameter. DIMENSIONS: - It’s 1,000 times the size of Spain, that is to said, 510,072,000 Km2. - 71% of it is covered by water - 29% of it is covered by land (continents and islands)
1.THE EARTH AND THE SOLAR SYSTEM