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Evidence, Location

• What is dark matter?
• Is there dark matter inside our galaxy?
• What is the difference between dark matter and dark energy?
• What evidence do we have that there is dark matter in our galaxy?
• What evidence do we have that there is dark matter in other galaxies?
• What evidence do we have that there is dark matter in galaxy clusters?
• Approximately what percentage of the total amount of matter is dark?

Composition

• What are MACHOS?
• What technique can we use to detect dark matter made of brown dwarves?
• What are WIMPS?

Effects

• What determines whether the universe will expand forever?
• What is the big crunch?
• What is the current opinion about the future of the universe?
• According to what we see, is there enough matter to make the universe recollapse?
• Why is it so hard to find out if the universe will recollapse or not?