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How many satellites does Mercury have?

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It has no natural satellites (moons).
Mercury is too close to the Sun to capture or keep any moons.

There is one NASA satellite orbiting Mercury: the MESSENGER spacecraft began mapping the planet in early 2013.
There are no moons nor satellites been sent to Mercury.
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How many satellites have landed on Mercury?

No satellites have landed probes on Mercury, nor are any expected prior to 2016. The spacecraft Mariner 10 flew to Mercury in 1974 and 1975, coming within 703 kilometers (43