Scientists believe that there is extra matter in the universe that is invisible. Research the topic of dark matter. You may use a Power Point presentation, animations or any other visual media. In your presentation answer the following questions?

What is the difference between ordinary matter and dark matter?

What evidence do scientists have for the existence of dark matter?

What is the composition of dark matter?

What is dark energy?

Why did physicists suggest the presence of dark energy?

Scientist believe that the universe started from the Big Bang. It will expand before gravitational forces pull it back in to start the entire process all over again. What effect does dark matter have on the future of our universe?

You may find the URL below useful.

http://science.hq.nasa.gov/universe/science/dark_energy.html

http://www.astro.columbia.edu/~archung/labs/spring2002/lab07.html