Principium 50 has gone out to subscribers and is now accessible to all.
Issue 50 | August 2025
Principium 50 – Contents
LEAD FEATURE
BOOK REVIEW The Ross 248 Project (https://i4is.org/wp-content/uploads/2025/08/BOOK-REVIEW-The-Ross-248-Project-Principium50-2508261234.pdf)
NEWS FEATURES
Interstellar News (https://i4is.org/wp-content/uploads/2025/08/Interstellar-News-Principium50-2508261234.pdf)
Project Hyperion Competition Results (https://i4is.org/wp-content/uploads/2025/08/Project-Hyperion-Competition-Results-Principium50-2508261234.pdf)
Breakthrough Discuss 2025 (https://i4is.org/wp-content/uploads/2025/08/News-Feature-Breakthrough-Discuss-2025-Principium50-2508261234.pdf)
Letter to the Editor: Where do you look for ET? (https://i4is.org/wp-content/uploads/2025/08/Letter-to-the-Editor-Where-do-you-look-for-ET-Principium50-2508261234.pdf)
International Astronautical Congress IAC25: Announced Interstellar Presentations (https://i4is.org/wp-content/uploads/2025/08/International-Astronautical-Congress-IAC25-Announced-Interstellar-Presentations-Principium50-2508261234.pdf)
The Journals (https://i4is.org/wp-content/uploads/2025/08/The-Journals-Principium50-2508261234.pdf
REGULARS
Become a member (https://i4is.org/wp-content/uploads/2025/08/Become-an-i4is-member-Principium50-2508261234.pdf)
Members page (https://i4is.org/wp-content/uploads/2025/08/The-i4is-members-page-Principium50-2508261234.pdf)
Next issue (https://i4is.org/wp-content/uploads/2025/08/next-issue-Principium50-2508261234.pdf)
Cover images (https://i4is.org/wp-content/uploads/2025/08/cover-images-Principium50-2508261234.pdf)