AI 中文总结
Gravitas是一个免费的浏览器天体物理实验室，通过可配置沙盒和引导式调查，支持学生进行预测、测量与发现，以弥补传统实验室无法处理天文系统的局限。
AI 中文摘要
天文学学生常常被要求推理那些无法在实验室中处理、在难以企及的时间尺度上演化、或仅能通过间接测量揭示自身的系统。Gravitas是一个免费的、基于浏览器的天体物理学环境，旨在将这些限制转化为实验的机会。其1.0.0版本结合了一个可配置的引力沙盒，包含59个即用型场景和22个引导式调查，共计636个步骤，约15-19小时的结构化工作。学生可以构建和修改系统、改变参考系、测量距离、角度、周期、能量、力和轨道元素，并通过凌星、视向速度、天体测量、旋转曲线、恒星演化和引力波显示来观察模拟系统。引导式活动采用预测-测试-测量-修订-解释的循环，保留学生的证据，并导出报告以供提交。教师指南、答案键、简短课堂路径、讲座和嵌入模式、可复现的分享链接、西班牙语本地化、键盘可访问导航和离线操作，降低了在入门天文学和物理课程中采用该模拟的实际障碍。一个公共仪表板报告了25个领域的243项科学检查，并说明了其背后的来源和容差。本文描述了Gravitas中可用的学习体验，展示了从简短演示到完整实验室练习的几种使用方式，并陈述了模型科学范围和局限性。其目的不是取代定量计算或观测，而是为学生提供一个可以进行预测、改变一件事、测量结果，并根据自己的证据构建解释的场所。
英文摘要
Astronomy students are often asked to reason about systems that cannot be handled in a laboratory, evolve over inaccessible timescales, or reveal themselves only through indirect measurements. Gravitas is a free, browser-based astrophysics environment designed to turn those limitations into opportunities for experimentation. Its version 1.0.0 release combines a configurable gravitational sandbox with 59 ready-to-run scenarios and 22 guided investigations comprising 636 steps and roughly 15-19 hours of structured work. Students can build and alter systems, change reference frames, measure distances, angles, periods, energies, forces, and orbital elements, and observe simulated systems through transit, radial-velocity, astrometric, rotation-curve, stellar-evolution, and gravitational-wave displays. Guided activities use a predict-test-measure-revise-explain cycle, retain the student's evidence, and export a report for submission. Instructor guides, answer keys, short classroom routes, lecture and embed modes, reproducible share links, Spanish localization, keyboard-accessible navigation, and offline operation lower the practical barrier to adopting the simulation in introductory astronomy and physics courses. A public dashboard reports 243 scientific checks across 25 areas and names the sources and tolerances behind them. This article describes the learning experiences available in Gravitas, illustrates several ways it can be used from a brief demonstration to a full laboratory exercise, and states the scientific scope and limitations of the models. The aim is not to replace quantitative calculation or observation, but to give students a place where they can make a prediction, change one thing, measure what follows, and build an explanation from their own evidence.
Comments13 pages, 8 figures. Gravitas version 1.0.0 is available at https://gravitas-sim.online/. The software and source archive are available at https://doi.org/10.5281/zenodo.22800610
