original question: Which celestial object has the artificial satellites of [Explorer 1]?
answer: earth
answer type: Celestial Object.
auxiliary information: Explorer 1 (1958 Alpha 1) was the first Earth satellite of the United States, launched as part of its participation in the International Geophysical Year. The mission followed the first two Earth satellites the previous year, the Soviet Union's Sputnik 1 and 2, beginning the Cold War Space Race between the two nations.  Explorer 1 was launched on January 31, 1958 at 22:48 Eastern Time (equal to February 1, 03:48 UTC because the time change goes past midnight) atop the first Juno booster from LC-26 at the Cape Canaveral Missile Annex, Florida. It was the first spacecraft to detect the Van Allen radiation belt, returning data until its batteries were exhausted after nearly four months. It remained in orbit until 1970, and has been followed by more than 90 scientific spacecraft in the Explorer series.
[Explorer 1] is an artificial satellite currently proximate to which celestial object?