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:''For information about the NASA project, see [[Project Mercury]].''

:''For information about the NASA project, see [[Project Mercury]].''

[[Mercury]] is the smallest planet in the [[Solar System]], and it is the closest to the [[Sun]].  It orbits the [[Sun]] in 88 (Earth) days. It rotates on its axis every 58.6 days,<ref>"The theory that Mercury is in [[synchronous rotation]] with its orbital motion was shattered in 1965. Astronomers Gordon Pettengill and Rolf Dyce used a radio telescope to make radar observations of Mercury’s spin rate. They found that Mercury’s rotation period is only 58.6 Earth days, not the 88 days accepted for nearly a century." [http://btc.montana.edu/messenger/elusive_planet/modern_times.htm]</ref> which is 3 rotations for every two orbits (called "3:2 resonance"). It is named for the Roman messenger god who was known as [[Hermes]] in Greek.

[[Mercury]] is the smallest planet in the [[Solar System]], and it is the closest to the [[Sun]].  It orbits the [[Sun]] in 88 (Earth) days. It rotates on its axis every 58.6 days,<ref>"The theory that Mercury is in [[synchronous rotation]] with its orbital motion was shattered in 1965. Astronomers Gordon Pettengill and Rolf Dyce used a radio telescope to make radar observations of Mercury’s spin rate. They found that Mercury’s rotation period is only 58.6 Earth days, not the 88 days accepted for nearly a century." [http://btc.montana.edu/messenger/elusive_planet/modern_times.htm]</ref> which is 3 rotations for every two orbits (called "3:2 resonance").   It can be seen from [[Earth]] only at sunrise and sunset. It is named for the Roman messenger god who was known as [[Hermes]] in Greek.

{{quotebox|Mercury has a very elliptical orbit. At its farthest distance from the Sun, it is nearly 50% farther than at its nearest distance to the Sun. <ref> [http://astroprofspage.com/archives/139 ] </ref> }}

{{quotebox|Mercury has a very elliptical orbit. At its farthest distance from the Sun, it is nearly 50% farther than at its nearest distance to the Sun. <ref> [http://astroprofspage.com/archives/139 ] </ref> }}