Astrophysics Science Project Integrating Research and Education

Particle Direction

In Activity 1, "Hess' Balloon Ride," you discovered that the particle detection rate increases at higher altitudes, exactly the opposite of Hess' prediction.

In Activity 2,"Geiger Array: Particle Direction" you will continue to investigate and study the unusual particles that perplexed Hess and many other scientists.


  1. Do these background radiation particles move in any particular direction?
  2. Are they coming from above, below, or one side or the other?

Do this:
Write the lab title and the investigation questions into your lab notebook unless a handout is provided.
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