In 1990, NASA and the European Space Agency launched the Ulysses probe to make the first observations of its polar regions.
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.
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。
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