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Portal Space Raises $50M For Solar Propulsion

by THEFUTURE.TEAM

April 9, 2026

Innovative Vision Rooted In Aerospace Expertise

Jeff Thornburg, a former engineer at the U.S. Air Force and SpaceX, is developing propulsion systems at Portal Space Systems. The company was founded in 2021. Portal Space Systems raised $50 million in a Series A round, reaching a valuation of $250 million. Investors include Geodesic Capital, Mach33, Booz Allen Ventures, ARK Invest, AlleyCorp, and FUSE.

Revolutionizing Propulsion With Solar Thermal Technology

Solar thermal propulsion is being developed as an alternative to chemical and electric systems. Government laboratories have studied the concept since the 1960s. Concentrated solar energy is used to heat propellant, increasing thrust and maneuverability. Demand has grown alongside rising satellite deployments and defense-related requirements.

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Strategic Investment And Military Interest

Portal Space Systems has received $45 million in funding linked to U.S. military programs, in addition to $67.5 million in private capital. Investors are evaluating applications in commercial satellite operations and defense scenarios, including spacecraft maneuverability in orbit.

Navigating The Path To Operational Flight

Portal is testing flight electronics in orbit and plans to launch a prototype spacecraft in October. A fully operational propulsion system is targeted for deployment by 2027 on the SuperNova spacecraft. The system includes a Hex thruster combining a solar concentrator and nozzle in a single unit.

Looking Beyond Today: Preparing For Future Propulsion Systems

Solar thermal propulsion is positioned as an alternative to nuclear systems, which face regulatory and technical constraints. In-orbit testing is being used to validate components, reducing reliance on ground-based infrastructure.

Industry Context

Demand for advanced propulsion systems continues to grow as satellite activity increases and orbital congestion expands. Portal Space Systems is developing technology focused on maneuverability, efficiency, and scalability in space operations.

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OpenAI Brings Unlimited Text Chats To Free ChatGPT Users

by News Editor

August 7, 2026

Unlimited Text Conversations Roll Out

OpenAI is removing limits on text-based conversations for all ChatGPT users, following the platform’s recent milestone of surpassing one billion weekly users.

The update introduces GPT-5.6 Luna as the default model for Free and Go users, replacing GPT-5.5.

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New “Think” Button For More Complex Questions

Alongside unlimited text chats, Free and Go users will gain access to a new “Think” button, allowing them to use additional reasoning power for more complex queries.

OpenAI noted that separate usage limits will continue to apply to file uploads, image generation, voice features and other multimodal tools.

Faster Responses For Paid Subscribers

The update also brings improvements for ChatGPT Plus and Pro subscribers. They will receive access to GPT-5.6 Sol, an upgraded model designed for everyday tasks such as web research, planning, writing, decision-making and answering questions. According to OpenAI, the model delivers shorter, more robust responses.

The company noted that this version is separate from the GPT-5.6 Sol model used in Codex and Work, which remains unchanged. Plus and Pro subscribers will also receive a new thinking slider, allowing them to adjust how much reasoning the model applies before generating an answer, depending on the complexity of the task.

OpenAI Reports Fewer Errors

According to OpenAI’s internal testing, GPT-5.6 Luna produces 62% fewer factual errors than GPT-5.5 Instant, while GPT-5.6 Sol reduces factual errors by 68%.

The updated GPT-5.6 Sol model is available to Plus and Pro users starting today. The remaining features for Free and Go users will roll out throughout the week, with unlimited text chats and the new Think button becoming available next week.