Difference between revisions of "Mercury"
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[[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. | [[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. | ||
| − | It was the study of this planet's orbit that [[Albert Einstein]] used to help confirm the theory of General Relativity. | + | It was the study of this planet's orbit that [[Albert Einstein]] used to help confirm the theory of General Relativity.<ref>Testing general relativity [http://sci.esa.int/science-e/www/object/index.cfm?fobjectid=31277 European Space Agency] Accessed July 16 2007</ref><ref>Albert Einstein [http://www.phy.hr/ Fizički odsjek] Accessed July 16 2007</ref> |
==Notes== | ==Notes== | ||
Revision as of 09:06, July 16, 2007
| Mercury | |
|---|---|
 Reprocessed Mariner 10 data was used to produce this image of Mercury. The smooth band is an area of which no images were taken. | |
| Symbol | 40px |
| Name of discoverer | Known to ancients |
| Name origin | Roman god |
| Orbital characteristics | |
| Order from primary | 1 |
| Physical characteristics | |
| Mass | 3.30e23 kg |
| Diameter | 4,880 km |
| Number of moons | None known |
| Composition | Iron, Silicate |
| Color | Reddish |
- This is about the planet Mercury. For information about the chemical element Mercury see Mercury (element).
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,[1] 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.
It was the study of this planet's orbit that Albert Einstein used to help confirm the theory of General Relativity.[2][3]
Notes
- ↑ "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." [1]
- ↑ Testing general relativity European Space Agency Accessed July 16 2007
- ↑ Albert Einstein Fizički odsjek Accessed July 16 2007