盖亚：Milky Way星系的三维普查
Gaia: 3-dimensional census of the Milky Way Galaxy
摘要：
空间天体测量与地面观测相比具有独特的优势：全天覆盖、相对稳定、温度和重力不变的操作环境提供的精度、准确度和样本量比地面结果大几个数量级。更重要的是，绝对天体测量是可能的。欧洲航天局的基石任务盖亚正在实现这一承诺。盖亚提供了5维相空间测量- 3个空间坐标和两个空间运动在天空平面-为银河系的恒星星族的代表性样本，包括超过20亿颗恒星，约占恒星的百分之一，超过百分之五十的半径。完整的6维相空间数据是从盖亚的视线（径向）速度为3亿最亮的恒星。这些数据对天体物理学和基础物理学做出了重大贡献，从太阳系到宇宙学。一场知识革命正在进行。
英文摘要：
Astrometry from space has unique advantages over ground-based observations: the all-sky coverage, relatively stable, and temperature and gravity invariant operating environment delivers precision, accuracy and sample volume several orders of magnitude greater than ground-based results. Even more importantly, absolute astrometry is possible. The European Space Agency Cornerstone mission Gaia is delivering that promise. Gaia provides 5-D phase space measurements - 3 spatial coordinates and two space motions in the plane of the sky - for a representative sample of the Milky way's stellar populations, including over two billion stars, being about one percent of the stars over about 50 percent of the radius. Full 6-D phase space data is delivered from Gaia's line-of-sight (radial) velocities for the 300 million brightest stars. These data make substantial contributions to astrophysics and fundamental physics on scales from the Solar System to cosmology. A knowledge revolution is underway.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
