UNIT 1 - GLOSSARY - KEY WORDS

The following words are important for this unit. Learn them:

• Universe
• Heliocentric and geocentric model
• Big Bang theory
• Telescope, probe and robots
• Galaxy
• Milky Way
• Star
• Color, size, bright
• Sun
• Planet
• Dwarf planet
• Comet
• Satellite
• Asteroid
• Meteorite
• Solar System
• Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune
• Inner and outer planets
• Rocky, liquid and gaseous
• Asteroid's belt
• Light year
• Moon
• Full moon, new moon, first quarter, third quarter

GOOD LUCK FOR THE EXAM (Thursday 31 october).

IF YOU HAVE QUESTIONS, WRITE COMMENTS PLEASE!

UNIT 1 - PLANETS AND OTHER BODIES

Hello astronauts! 

Planet Kepler 10-b, discovered by NASA's Kepler mission

What is a PLANET? They are bodies that: 

- are spherical or almost spherical

- turn around a star

- can atract other bodies

Other bodies:

- DWARF PLANETS: They are spherical but they are smaller and they do not attract other bodies.

Dwarf planets, and their sizes compared with planet Earth

- SATELLITES: They are bodies that turn around planets. For example: moon, titan...

In the following picture you can find different "moons" in the solar system, look how big are Jupiter's satellites:

Different satellites in the Solar System

- COMETS: They are icy small bodies that travel showing a tail.

In the following video, you can find information about Halley's Comet, the most famous periodic comet:

- ASTEROIDS: They are rocky bodies with a variable size; from few metres to several kilometres.

When asteroids enter into atmosphere, they are called METEORITES. 

Look this amazing video about a meteor in Russia, which was seen on February, 15th 2013 in Russia. 1500 people injured by the expansive wave.

http://es.wikipedia.org/wiki/Bólido_de_Cheliábinsk

Are you afraid of meteorites? :O