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Delta 级是 Virgin Galactic 继 VSS Unity 之后的下一代亚轨道太空飞机计划，旨在提高飞行频次并降低单座成本。此次征名延续了该公司以「VSS」前缀命名载具的传统——VSS 代表 Virgin Space Ship。四个候选名称中，Horizon 与 Explorer 偏向探索意象，Ascend 强调上升动作，Apeiron 则源自希腊哲学中「无限」或「无界」的概念，后者在命名风格上更具抽象色彩。原文未提供各名称的官方释义或设计团队倾向。
从行业背景看，商业亚轨道旅游市场在 2020 年代中期仍处于早期商业化阶段，Virgin Galactic 与 Blue Origin 是主要参与者。Delta 级的命名征集可视为该公司在技术迭代周期中维持公众关注度的一项举措。原文未提及该机型的具体首飞时间表或票务信息，相关素材中亦无补充内容。
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As Virgin Galactic nears christening the first of its next-generation spaceship designed to launch customers on suborbital flights, it still is missing a key component—a name.
The self-described "commercial spaceline," which was founded by British tycoon Richard Branson, has turned to the public to vote on what to call the new vehicle. The spaceplane will be a member of Virgin Galactic's Delta-class fleet, succeeding SpaceShipTwo, which carried Branson and 31 others on 12 short hops above the US-defined boundary between Earth and space.
"You can vote for one of four finalist names for a spaceship that will join Virgin Galactic's growing fleet and the next chapter in our journey to expand access to space," the company announced on its website on August 11. "Name a Virgin Galactic spaceship, shape a piece of spaceflight history."