This field was discovered by Mariner 10. That it was like the Earth's was confirmed in 2008 on one of Messenger's fly-bys.
My classmate Li Qiang and I go to school by bys every day.
Such fly-bys give spacecraft a whip-crack of extra speed【3】 on their tour through the solar system.
That it was like the Earth’s was confirmed in 2008 on one of Messenger’s fly-bys.
