Meet Abby, the 22-year-old who wants to be the first astronaut on Mars

When Abigal Harrison was 5 years old, she remembers standing in her backyard on a cold winter Minnesota night when the air was clear, looking up at the night sky with an overwhelming sense of awe and wonder. Her mind swam with questions, she recalls. She wanted to know what the stars were made of and how many there were. She wanted to go to space.

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