Suspended in a Sunbeam alternatives: newsletters like it

SubstackEvery two weeks · last post 17 days ago

From recent posts: The Quantum Cat publishes weekly science reports covering astronomy, particle physics, and the history of mathematics. It targets readers interested in current scientific discoveries and space exploration, with content…

Likely audience: Space enthusiasts

2 shared topics

SubstackWeekly · last post 7 days ago

A place where ancient myths and religions live in a new light. "The most beautiful thing we can experience is the mysterious." A. Einstein

Likely audience: Poetry readers

1 shared topic

SubstackDaily · last post 4 days ago

From recent posts: DeFranco Daily publishes a rotating mix of daily news digests and weekly deep dives covering US and international politics, entertainment controversies, legal developments, and technology. The publication serves readers…

Likely audience: General news readers

1 shared topic

SubstackMonthly or less · last post Aug 25, 2026

From recent posts: This publication covers startup ecosystems, venture capital training, and founder networking events, targeting entrepreneurs, investors, and career-changers. It mixes conference announcements, recruitment drives, and…

Likely audience: Tech industry leaders

1 shared topic

SubstackWeekly · last post 5 days ago

Likely audience: Philosophy enthusiasts

1 shared topic

SubstackMonthly or less · last post 4 days ago

From recent posts: The Curiosity Files is a weekly newsletter covering ancient history, archaeology, space exploration, and cutting-edge science. It publishes a mix of feature articles on topics like human origins, neuroscience, and…

Likely audience: General curious readers

1 shared topic

SubstackSeveral times a week · last post 4 days ago

From recent posts: The Innermost Loop publishes weekly deep-dive articles on the technical and geopolitical evolution of artificial intelligence, including LLM benchmarks, safety research, and infrastructure costs. The publication targets…

Likely audience: Policy makers and regulators

1 shared topic

SubstackMonthly or less · last post 37 days ago

Seed stage robotics and physical AI venture firm.

Likely audience: Venture capitalists

1 shared topic

SubstackSeveral times a week · last post 3 days ago

From recent posts: This publication delivers destination guides, travel journalism, and cultural heritage content focused on locations like Albania, Helsinki, St. Petersburg, Sri Lanka, and South Africa's Sabi Sand. It operates as a…

Likely audience: Travel enthusiasts

1 shared topic

SubstackMonthly or less · last post Aug 14, 2026

From recent posts: What Follows with Nate Thuli publishes interviews with aerospace leaders, industry experts, and journalists alongside event coverage for aviation professionals and enthusiasts. The content mixes long-form discussions on…

Likely audience: Aviation industry professionals

1 shared topic

SubstackMonthly or less · last post 21 days ago

From recent posts: Notes on Shapeshifting publishes poetry, philosophy, mental health essays, and book reviews in a mixed format of long-form articles and decorative emoji messages. The publication targets readers interested in…

Likely audience: Poetry enthusiasts

1 shared topic

Substacklast post Jun 26, 2026

From recent posts: This newsletter aggregates diverse short headlines covering recent breakthroughs in fields such as AI, genetics, climate science, and astrophysics. It serves as a curated digest of scientific news without providing…

Likely audience: Science enthusiasts

1 shared topic

SubstackSeveral times a week · last post 3 days ago

From recent posts: ScienceDaily publishes a weekly newsletter dedicated to the latest research in astronomy, cosmology, and particle physics. The content features in-depth articles on topics ranging from the geometry of the universe and…

Likely audience: Physics researchers

1 shared topic

SubstackSeveral times a week · last post 3 days ago

From recent posts: Today's Facts publishes daily aggregations of US politics, international relations, and breaking news including crime, sports, and historical trivia. The publication targets readers seeking a broad overview of global…

Likely audience: General news consumers

1 shared topic

SubstackMonthly or less · last post 39 days ago

Unofficial grassroots community of The All-In Podcast. Hosting in-person events around the world and online to connect like-minded fans. Organized by Rae Lambert.

Likely audience: Event organizers

1 shared topic

SubstackSeveral times a week · last post 4 days ago

Welcome to the place where science is cool. We share serious science without the jargon, important discoveries, clear explanations, and facts worth knowing.

Likely audience: Science enthusiasts

1 shared topic

SubstackEvery two weeks · last post 5 days ago

Cosmic Guidance by Leah Whitehorse

Likely audience: Astrology enthusiasts

1 shared topic

SubstackWeekly · last post 5 days ago

Likely audience: Tech enthusiasts

1 shared topic

SubstackEvery two weeks · last post 27 days ago

From recent posts: The Principle of Optimism publishes a mix of long-form profiles on industrial innovation and robotics, curated hardware startup lists, and weekly links covering European manufacturing, biotechnology, and startup…

Likely audience: Hardware founders

1 shared topic

SubstackWeekly · last post 5 days ago

Vedic astrology and how it applies to our daily lives.

Likely audience: Spiritual practitioners

1 shared topic

SubstackSeveral times a week · last post 2 days ago

From recent posts: Semi Doped publishes daily updates on semiconductor industry news, AI infrastructure spending, and hardware supply chain developments alongside occasional deep-dive articles and interviews. The publication targets…

Likely audience: Semiconductor industry analysts

1 shared topic

SubstackEvery two weeks · last post 3 days ago

Exploring the intersection of the future of learning, AI and philosophy through a human-centred lens

Likely audience: Cognitive scientists

1 shared topic

SubstackEvery two weeks · last post 9 days ago

From recent posts: Alecto Chaos publishes weekly astrological forecasts, tarot readings, and political commentary blending celestial events with sociopolitical analysis. The publication targets readers interested in astrology and tarot…

Likely audience: Astrology enthusiasts

1 shared topic

SubstackWeekly · last post 22 days ago

From recent posts: China in Space publishes weekly reports on Chinese space policy, satellite constellation launches, and orbital collision risks. The publication covers technical specifications of state and commercial missions alongside…

Likely audience: Space industry professionals

1 shared topic