It’s 1908, and most of the scientific community thinks the universe stops at the edge of the Milky Way. But Henrietta Leavitt, a computer at the Harvard Observatory, believes that the only reason the universe seems so small is because they have no way to measure it. Dear Miss Leavitt follows Henrietta as she sets out to find an accurate way to measure the distance between Earth and faraway stars, laying the foundation for legendary astronomers like Edwin Hubble to make discoveries that prove the universe is bigger than anyone imagined and change astronomy forever—all at a time when women weren’t even allowed to operate a telescope.