1.34 Describe how the orbit of a comet differs from that of a planet

Source: http://www.earthshots.org/2007/02/mcnaughts-comet-by-john-white/

Scroll over the lines, to see the answers
a. Comets are usually made from _________

b. Comets have highly elliptical _______ compared to planets

c. Comets usually travel _________ than ________

d. Comets usually have long _______ , made when the heat from the Sun which vaporises the comet

1.35

1. What is a GALAXY?
A Galaxy is a large collection of billion of stars

2. Which galaxy are we in?

We are in the Milky Way

3. Source an image of our galaxy

Source: http://www.gearlog.com/2010/11/planet_from_outside_milky_way.php

1. 1. 
      4. What type of galaxy are we in?

We are in a spiral galaxy

5. How many galaxies are the in the Universe?

There are hundreds of billions of galaxies in our universe

1.32 Explain that gravitational force

-causes planets to orbit around the sun
-causes the moon and artificial satellites to orbit the Earth
-causes comets to orbit the sun