Looking closer, we observe other similarities between Earth and Mars. We have known for a long time that Mars has an atmosphere. We now have the capability to see that it also has weather features that resemble those on Earth. For example, both planets experience seasonal dust storms, as shown in these images.

  !   Compare the atmospheric features of Mars and Earth. Think about how the atmosphere interacts with the biosphere on Earth. How might the Martian atmosphere influence the possibility of life there?

3. What do these images tell you about the two planets?