What is Dark Matter and Dark Energy?

What percentage of the known universe is made of matter that we can see and interact with?

• Less than 5%

• About 25%

• About 70%

• More than 90%

Why is dark matter important for the structure of the universe?

• It helps galaxies and complex structures to form.

• It emits light, making galaxies visible.

• It causes the universe to expand faster.

• It is made of black holes that attract stars.

How do scientists know dark matter exists, even though it's invisible?

• They can directly observe it with powerful telescopes.

• It emits unique gamma rays when it interacts with normal matter.

• It bends light passing nearby due to its gravitational pull.

• It is made of virtual particles that appear and disappear.

What did Edwin Hubble discover about light from distant galaxies that showed the universe is expanding?

• The light appeared brighter than expected.

• The light's wavelength shifted towards the red end of the spectrum.

• The light's wavelength shifted towards the blue end of the spectrum.

• The light was completely absorbed by empty space.