These come from surface temperature and pressure records as well as balloon and satellite surveys.
这些观测由地表温度和气压记录以及气球、卫星观测组成。
A downside of the approach is that the balloon would make the satellite a larger target while inflated, temporarily increasing the risk of a collision with another satellite.
缺点也随之而来气球充气的时候会使卫星比以前要大，临时增加了卫星和其他卫星相撞的危险。
The idea of inflatable spacecraft is not new. The Echo I - NASA's first communication satellite - was essentially 100-foot-wide Mylar balloon that reflected radio transmissions from the ground.
充气式航天器并不是什么新颖的想法，NASA的第一颗通讯卫星回声1号实际上就是一个宽30米的聚酯薄膜大气球，它是用来发射来自地面的无线电广播的。
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