What is Earth's only natural satellite?
AnswerThe Moon
The Moon is Earth's single natural satellite.
Science · Facts & stats
Satellite facts & stats
7 fact-checked facts about satellites, orbits and space technology, each with the reason behind it. 5 more are in today's round and join this page after it closes.
The basics
What does GPS stand for?
AnswerGlobal Positioning System
GPS uses satellites to calculate location.
Going deeper
In what year was Sputnik 1 launched?
Answer1957
Sputnik 1 went into orbit on October 4, 1957.
What was the first successful US satellite?
AnswerExplorer 1
Explorer 1 launched in January 1958.
In what year was the Hubble Space Telescope launched?
Answer1990
Hubble was deployed from the Space Shuttle in 1990.
Expert level
How many GPS satellites are needed for a basic 3D position fix?
Answer4
Four satellites allow a receiver to solve for position and clock error.
Explorer 1 helped discover what?
AnswerThe Van Allen radiation belts
Its instruments detected Earth's radiation belts.
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