Sunday, 11 January 2015

1d) Astronomy

Gravitational field strength changes in different planets. The gravitational field strength on the Earth is 10.

Gravitational force:

  • Causes moons to orbit planets 
    • The Earth's moon rotates on own axis every 27.5 days and from Earth we always see the same side of the moon 
  • Causes the planets to orbit the Suns 
    • Mercury 
    • Venus 
    • Earth 
    • Mars 
    • asteroid belt 
    • Jupiter 
    • Saturn 
    • Uranus 
    • Neptune 
  • Causes artificial satellites to orbit the Earth 
  • Causes comets to orbit the sun 
    • Balls of ice and dust 
    • orbits the sun 
    • tail formed when near the sun which points away from the sun called solar wind 
    • speed INCREASES when close to the sun due to gravitational pull 
    • elliptical (egg-shaped) orbit 
Orbits are objects that travel in a circle and is the balance between a forward motion of object and force pulling inwards 

Orbital speed= (2 x π x orbital radius) / Time period 
V= (2 x π x r) / T 

The universe is a large collection of billions of galaxies, which is a large collection of a billion stars. Our solar system is called the Milky Way 

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