当探测器最终在火星上空100米处减速时，它停留在空中并检查着陆区域。
When the probe finally slowed down at 100 meters above Mars, it stayed in the air and checked the landing area.
1990年，NASA和欧洲空间局发射了尤利西斯号探测器，对太阳极地区域做了首次观察。
In 1990, NASA and the European Space Agency launched the Ulysses probe to make the first observations of its polar regions.
同样让人困惑的是卡西尼(Cassini)空间探测器探测相同区域的结果。它记录到的原子带的能量要高一些，超过了6000电子伏。
Equally puzzling are observations of the same boundary region with an instrument on the Cassini spacecraft, which recorded the density of atoms at higher energies, above 6,000 electron volts.
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