In a nutshell, Uriel is a fictional planet in Madeleine L'Engle's sci-fi/fantasy book A Wrinkle in Time… 'the third planet of the star Malak in the spiral nebula Messier 101,' to quote the book exactly. It is a beautiful and peaceful planet, inhabited by beautiful and peaceful creatures.
On the way to rescue Dr. Murry, Meg, Charles Wallace, and Calvin make a pit stop on Uriel. The purpose for this pit stop, according to Mrs. Whatsit, is 'more or less to catch our breaths. And to give you (the children) a chance to know what you're up against.'
To fully understand this planet and its role in the story, a little background knowledge is important.
The answer is
To tell Penelope about her son's return.
Here is the answer: At the very start of the radio drama, Orson Welles had repeatedly said that the said drama is a science fiction. The sci-fi radio drama was said to cause mass panic because of its realistic script. Orson Welles also believed there might have been a small percentage of the population that was panicking. It was also stated in New York Times, that people were in a mass panic because of the drama itself. However, C.E Hopper had proven that no such thing had happened.
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