Dark Matter and the Universe Quiz

What unexpected observation about star speeds in galaxies led to the hypothesis of dark matter?

• Stars closer to the center move slower than expected.

• Stars move in random directions.

• All stars move at the same speed regardless of distance.

• Stars further from the center move faster than expected.

What are MACHOs in the context of dark matter?

• Massive Compact Halo Objects

• Mysterious Cosmic Halo Objects

• Molecular Atomic Halo Objects

• Magnetic Cosmic Halo Objects

What is the main characteristic of WIMPs that makes them difficult to detect?

• They are extremely large.

• They interact weakly with ordinary matter.

• They emit strong radiation.

• They are only found in black holes.

What is the main challenge in detecting WIMPs?

• They move too slowly to be detected.

• Their interactions are extremely rare.

• They are only present in distant galaxies.

• They are too large to fit in detectors.

What is the role of theoretical physicists like Katie Freese in the study of dark matter?

• They build the detectors.

• They develop theories and models.

• They conduct field experiments.

• They analyze cosmic ray data.

Why do scientists conduct dark matter experiments underground?

• To protect the experiments from earthquakes.

• To keep the equipment cool.

• To use the Earth's magnetic field.

• To avoid interference from cosmic rays.

What is the expected outcome when a WIMP collides with an atom?

• A change in temperature.

• A loud noise.

• A flash of light.

• A large explosion.

What is the principle behind Juan's experiment to detect dark matter?

• Measuring temperature changes in a vacuum.

• Observing light emitted by dark matter.

• Listening for sound produced by particle interactions.

• Using lasers to detect dark matter.

What is the significance of a negative result in dark matter experiments?

• It confirms the presence of dark matter.

• It suggests a need to look elsewhere.

• It proves dark matter does not exist.

• It indicates equipment malfunction.

What is the main reason for scaling up the size of dark matter detectors?

• To increase the number of interactions detected.

• To reduce the cost of experiments.

• To make the detectors more portable.

• To improve the accuracy of temperature measurements.