A constellation of twenty-eight Earth-imaging, 3-unit CubeSats, each with a mass of about 5 kg, developed by Planet Labs, of San Francisco. The constellation was launched on 9 January 2014, from Virginia.
科学参考收录了60776条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。