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Article on Previous Explorations of Mars by NASA

What is the main idea of this article?

When did the Mariner spaceshuttles explore Mars?

What happened to Mariner 3?

How long did it take Mariner 4 to reach Mars?

NASA writes that "Mariner 3 and 4 were identical spacecraft designed to carry out the first flybys of Mars"

What does "identical" mean in this context?

NASA writes "The pictures, played back from a small tape recorder over a long period, showed lunar–type impact craters…."

What does "period" mean in this context?

In the same sentence below, what is another word that means the same as "impact"?

"The pictures, played back from a small tape recorder over a long period, showed lunar–type impact craters…."?

The article says that "…continuing long–term studies of the solar wind environment and making coordinated measurements with Mariner 5…."

What does "coordinated measurements" mean in this context?

How many years ago did we first photograph Mars?

Is there anything you do not understand about this reading?