: The collection includes his defense of reclassifying Pluto as a dwarf planet and his responses to skepticism regarding climate change and evolution.

You can find Letters from an Astrophysicist at several major retailers: : Available for ~$11.18 (new).

: Priced at ~$15.96 (currently discounted from $19.95). Barnes & Noble : Available for ~$19.95 (new). PangoBooks : Offers used copies for as low as ~$2.00. Neil deGrasse Tyson Shares His Letters In New Book

: Features letters to his parents, NASA, and a poignant open letter written on September 12, 2001, reflecting on the events at Ground Zero.

The book is structured as a series of letters from people in all walks of life—including students, prisoners, and priests—followed by Tyson's succinct and passionate replies.

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