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Blog

Principium 50

1 September 2025

Principium 50 has gone out to subscribers and is now accessible to all.

Members Newsletter – August

29 August 2025

News from i4isOur US colleagues, led by Robert Kennedy, are now working with partners on another NASA NIAC Phase 2 study on betavoltaics as in our 2023 paper, Swarming Proxima Centauri: Optical Communication Over Interstellar Distances (https://arxiv.org/abs/2309.07061). And members may have noticed some fuss around the third known interstellar object, 3I/Atlas, which has included much input from our […]

3I/ATLAS: How low should we go?

21 August 2025

Adam Hibberd 3I/ATLAS, the interstellar object, is in the Solar System and making its presence known, not only to astronomers but also to the world’s media. My paper with Avi Loeb and Adam Crowl examined the hypothesis that 3I/ATLAS might be alien technology, go here. I confess this paper has been somewhat of a hit! […]

3I/ATLAS: An Interstellar Controversy

21 August 2025

Adam Hibberd When you have a surprise, uninvited visitor gatecrash your party, you are liable to treat them cautiously at first and then after a visual appraisal reveals they are worthy of acceptance, maybe curiosity will strike and you may start asking questions to find out more about them. You may by the end of […]

3I/ATLAS: What would Juno need to do?

21 August 2025

Adam Hibberd Having demonstrated yesterday that a reasonably low DeltaV (velocity increment) applied by the Juno’s engine could achieve a significantly closer approach to 3I/ATLAS than would otherwise be the case if Juno stayed in its current Jupiter orbit, surely that would be the end of the matter? The answer is ‘not quite’, since this […]

Project Hyperion – Winners Announced

1 August 2025

London, UK – 23 July 2025 — The UK-based not-for-profit company Initiative for Interstellar Studies (i4is) is delighted to reveal the winners of the Project Hyperion Design Competition, a landmark global challenge that called upon interdisciplinary teams to envision a generation ship—a crewed interstellar spacecraft designed for a 250-year journey to a habitable planet. The […]

Juno and 3I/ATLAS, a New Lease of Life?

29 July 2025

Adam Hibberd Juno the wife and sister of Jupiter in Greek mythology, is also a spacecraft currently orbiting the planet Jupiter. The spacecraft suffered a major setback in 2016 when the main engine became unusable necessitating key alternative arrangements to be made to the Juno mission plan. A paper by Avi Loeb, Adam Crowl and […]

Members Newsletter – July

25 July 2025

Preprints from Principium 50, August 2025Members can access preprints of articles to be published in Principium issue 50 August 2025. Please report any errors or omissions to the Editor at – john.davies@i4is.orgThe preprints are –· International Astronautical Congress – IAC25 – Sydney 29 September – 3 October -Announced Interstellar PresentationsWhether you are attending this year’s […]

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  • Sailing to Apophis

Blog

Principium 53

3 June 2026

Principium 53 has gone out to subscribers and is now accessible to all

Members Newsletter – May

2 June 2026

The Board of Directors of i4is and the Editor of Principium will make the following announcement in the next issue of Principium:”The i4is Board has been considering the future of Principium, given changes in the ways in which people receive and consume information and content. We have decided to pause the publication of Principium with […]

What’s up with 1998 KY26?

1 June 2026

Adam Hibberd I’m not sure whether you might already be aware of this but there are really weird objects orbiting the Sun which astronomers have observed and tried to categorize as a new class of object, ‘the dark comets’. But what makes them weird? It’s the rather strange fact that the peculiar orbital paths they […]

Mission to an Interstellar Object

5 May 2026

Adam Hibberd Many readers in-the-know will have heard of the future ESA ‘Comet Interceptor’ mission, due to launch in 2029. For those not-in-the-know it is a spacecraft desgined to loiter at the famous Sun/Earth Lagrange 2 (L2) point for a few years, waiting for a ‘pristine’ Oort Cloud comet to come flying in to the […]

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  • Sailing to Apophis
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Principium 53

Members Newsletter – May

What’s up with 1998 KY26?

Mission to an Interstellar Object

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