And NASA used a plane and a Pegasus rocket to launch a satellite. The satellite will observe the sun, in hopes of improving space weather forecasting.

美国国家航空和宇宙航行局利用一架飞机和一枚飞马火箭发射了一枚卫星。这枚卫星将要探测太阳，并有望提高太空天气预测能力。

youdao

The market for launching small satellites is presently only partly served by the Pegasus rocket, which is launched at high altitude by a commercial jet aircraft.

在小型卫星的发射这一市场，目前只有天马火箭公司提供一些服务。他们用商务喷气式飞机在高空进行发射。

youdao

The company's Pegasus XL rocket was flown to a launch altitude of about 39, 000 feet by a specially configured L-1011 "Stargazer" jetliner taking off from the Kwajalein Atoll in the Marshall Islands in the Pacific, near the equator about halfway between Hawaii and Australia.

WSJ: NASA NuStar Telescope to Hunt for Black Holes

One problem was that the rocket used as a booster (a type known as Pegasus, that is designed to be used as a satellite launcher) is usually dropped from its launch aircraft at an altitude of 12, 200 metres.

ECONOMIST: Hypersonic aviation