1. Sarah Frazier, "Real Martians: How to Protect Astronauts from Space Radiation on Mars," NASA, updated: Aug. 6, 2017, https://www. nasa. gov/feature/goddard/real-martians-h ow-to-
protect-astronauts-from-space-radia tion-on-mars.
A. The second source of energetic particles is harder to block,
B. Throughout the entire trip, astronauts must be protected from two
sources of radiation,
C. The first comes from the Sun, which regularly releases a steady stream
of solar particles
D. These particles come from galactic cosmic rays.
E. A human mission to Mars means sending astronauts into space for a
minimum of a year,