The Moon (Earth)

• Earth’s only natural satellite.
  
• Quarter of the diameter of the Earth.
  
• Fifth largest satelilite in the Solar System.
  
• Second densest moon in the Solar System, after Jupiter’s Io.
  
• The Moon is in synchronous rotation with the Earth, which means that it is always showing the same face towards the Earth.
  
• The Moon’s gravitational pull produces the Earth’s tides.
  
• The Moon currently orbits at a distance of 30 Earth diameters away from the Earth.
  

Titan (Saturn)

• Saturn’s largest moon.
  
• The Solar System’s only natural satellite to have a dense atmosphere.
  
• Apart from Earth, Titan is the only other object to have stable body of surface liquid.
  
• Second largest moon in the Solar System.
  
• Larger by volume than Mercury but only half as massive.
  
• Primarily composed of water ice and rock.
  
• Atmosphere mostly composed of nitrogen.
  
• Titan’s wind and rain create a similar surface of dunes, valleys and seas.
  
• Titan could possibly be the host of prebiotic organic chemistry or even microbial life.
  

Io (Jupiter)

• Densest moon in the Solar System.
  
• Innermost of Jupiter’s moons.
  
• Named after one of the lovers of Zeus.
  
• Volcanically active.
  

Europa (Jupiter)**

• Slightly smaller than Earth’s Moon.
  
• Atmosphere primarily composed of oxygen.
  
• Surface covered with ice.
  
• Discovered in 1610 by Gallileo.
  

Ganymede (Jupiter)

• Largest and has most mass satellite in the Solar System.
  
• Larger than the planet Mercury.
  
• Composed of rock and ice.
  
• There may be a saltwater ocean beneath the ice.