RT Steve Jurvetson (@FutureJurvetson)Better than Black 🛰In this clip from the upper stage of one of this week’s Starlink launches, you can see the stack of sats and then a very shiny mirror that reflects the upper stage spinning away over Earth. So much cool engineering visible here: https://t.co/M0gYV0m2oRThe first Starlink sats were black to avoid being visible at dawn and dusk (when the sun still illuminates them at high altitude, but people on the ground are in the dark). But black absorption heats up t ...

Core Viewpoint - The expansion project of the Beijing-Harbin Expressway (Jingha Expressway) in the Shenshan section is progressing steadily, with expected completion for the Beijing direction by the end of July and full two-way ten-lane operation by the end of September, one year ahead of schedule [1][2] Group 1: Project Overview - The Shenshan section of the Jingha Expressway is a crucial transportation artery in Liaoning, originally a two-way six-lane road that has been in service for 22 years, now unable to meet the increasing travel demands due to rapid economic development [1] - The expansion project, initiated in August 2022, spans 238.04 kilometers, starting from the Jiumenkou Tunnel in Suizhong County and passing through various cities and counties, involving 15 toll stations, 20 interchanges, 6 service areas, and 58 overpasses, with the main line of 222.08 kilometers [1] Group 2: Construction Challenges and Innovations - The construction faced numerous challenges, prompting the adoption of an innovative "construction while traffic" model, enhancing emergency response efficiency and optimizing traffic organization through dynamic adjustments [2] - New technologies such as "dual-layer continuous paving + 3D intelligent paving" have been implemented to improve road surface precision and paving efficiency, alongside a smart management platform for real-time monitoring of the entire construction process [2] Group 3: Progress and Impact - As of June 22, the project has achieved significant completion rates: 98.6% for the subgrade, 99.8% for bridges and culverts, 92.8% for pavement, and 94.3% for tunnels [2] - The completion of the expressway is expected to greatly enhance traffic efficiency and service levels, significantly improving regional transportation conditions and promoting economic collaboration and revitalization in Northeast China [2]