They Shall Have Stars by James Blish

Year 2018!

In a future where Earth is under the oppressive control of a bureaucratic government, humanity's hope for freedom and exploration lies in the development of groundbreaking technologies. The story follows the ambitious efforts of a group of scientists and visionaries who, despite facing political obstacles and ethical dilemmas, strive to unlock the secrets of anti-gravity and longevity. Their quest not only challenges the status quo but also sets the stage for humanity's expansion into the cosmos, promising a new era of exploration and discovery beyond the confines of Earth.

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