Definitions 1
What's a galaxy?
Galaxies are groups of stars, gas and cosmic dust which gravity holds together.
What's a star?
A star is an astronomical object that emits light
First planet of the solar system
Mercury.
Despite is the closest planet to the sun, it isn't the hottest planet because it has no atmosphere to trap heat.
The sixth planet from the sun
Saturn
It has a system of rings made of ice
Rotation
Earth spins on its axis in an anti-clockwise direction. This is why the sun rises in the east ande sets in the west
What's a lightyear?
A lightyear is the distance light travels in one Earth year - a speed of around 300 000 km per second
What's a planet?
A planet is an astronomical object that doesn't emit light
Second planet of the solar system
Venus
Is around the same size as the Earth and has a dense atmosphere of carbon dioxide. It doesn't have any satellites.
The seventh planet from the sun
Uranus
The third biggest planet in the solar system.
Revolution
While Earth spins on its axis,it also orbits the sun on an elliptical path. A complete revolution takes 365 days and 6 hours.
What was the Big Bang?
The Big Bang was a huge explosion. Scientist think that the Big Bang started the universe.
What´s a satellite?
Satellites orbit planets. They're smaller than planets and reflect light rather than emit it. For example: The moon.
The third planet from the sun
The Earth
Is the only planet we know of in the universe with capacity to support life
The eighth planet from the sun
Neptune
Is the planet furthest from the sun
Paralels
Parallels are the imaginary line we draw around the Earth perpendicular to its axis. The most important parallel is the Ecuator
Which is our galaxy?
Our galaxy is the Milky Way
What´s an asteroid?
Asteroids are small objects that orbit the sun. They are usually madeos metal and rock. They don't have tails.
The fourth planet from the sun
Mars
It looks red because it has a very high iron content.
*The earth
Definition of time zones
As earth is a sphere,is 360º, we divide 360º by 24 hours. This results in 24 15º strips which we call time zones. Each strip has a meridian running through the middle.
Meridians
Meridians are the imaginary lines we draw from the north pole to the south pole. The Greenwich Meridian is the main meridian
What's the universe?
The universe is all the energy, time, matter and space
What's a meteorite?
Meteorites are fragments, mainly from asteroids or comets,which pass through the atmosphere and fall to the Earth.
The fifth planet from the sun
Jupiter
Is the biggest planet in the Solar system
Tell the three common types of projections in maps
1. Cylindrical projection
2. Conic projection
3.Azimuthal projection
Effects of projection in maps
1.Cylindrical projection: It distorsionates the land masses close to the poles.
2. Conic projection: It's likely to represent the temperate zones
3.Azimuthal projection: It only projects poles