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Topic: Mercury (planet)

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In the News (Tue 21 Nov 17)

  Mercury (planet) - MSN Encarta
The observation of these changes in Mercury’s perihelion was one of the first confirmations of Einstein’s general theory of relativity, which predicted such variation due to the curvature of space caused by the enormous mass of the Sun.
Mercury’s axis is almost perfectly vertical, unlike Earth’s axis, which is tilted 23.5 degrees.
Mercury’s high density indicates that the relatively dense and abundant element iron accounts for a large proportion of the planet’s composition.
encarta.msn.com /encyclopedia_761556181/Mercury_(planet).html   (2155 words)

  Mercury (planet) - Wikipedia, the free encyclopedia
Mercury's surface is very similar in appearance to that of the Moon, showing extensive mare-like plains and heavy cratering, indicating that it has been geologically inactive for billions of years.
Mercury's orbit is inclined by 7° to the plane of Earth's orbit (the ecliptic), as shown in the diagram on the left.
Mercury's precession showed the effects of mass dilation, providing a crucial observational confirmation of one of Einstein's theories—Mercury is slightly heavier at perihelion than it is at aphelion because it is moving faster, and so it slightly "overshoots" the perihelion position predicted by Newtonian gravity.
en.wikipedia.org /wiki/Mercury_(planet)   (4630 words)

 Mercury (planet) - MSN Encarta
Mercury’s mean density, 5.4 g/cm³, is nearly as great as that of Earth and is higher than that of any of the other planets.
The point in Mercury's orbit at which the planet is closest to the Sun (called the planet’s perihelion) moves a tiny amount every orbit, too much to be accounted for by the gravitational influence of other planets.
Mercury is a poor reflector of sunlight because its surface consists of rough, porous, dark-colored rock.
ca.encarta.msn.com /encyclopedia_761556181/Mercury_(planet).html   (807 words)

Mercury is the closest planet to the Sun and the eighth largest.
Mercury's interior is dominated by a large iron core whose radius is 1800 to 1900 km.
Mercury is often visible with binoculars or even the unaided eye, but it is always very near the Sun and difficult to see in the twilight sky.
www.seds.org /nineplanets/nineplanets/mercury.html   (1265 words)

 Vulcan (planet) - Wikipedia, the free encyclopedia
Vulcan was the name given to a small planet proposed to exist in an orbit between Mercury and the Sun in a 19th-century hypothesis.
Having observed the transit of Mercury in 1845, he assumed that he what he was observing was another transit, but of a previously undiscovered body.
Observing a planet inside the orbit of Mercury would be extremely difficult, since the telescope must be pointed very close to the Sun, where the sky is never fl.
en.wikipedia.org /wiki/Vulcan_(planet)   (1852 words)

 Mercury Information, Planet Mercury, The Planet Mercury at SPACE.com
The planet Mercury is the closest planet to the Sun within the solar system.
Mercury was named by the Romans after their god of the same name.
The only spacecraft to come close to Mercury was Mariner 10 from 1974 to 1975, which was only able to map 40%—45% of the planet's surface.
www.space.com /mercury   (221 words)

Mercury is the closest planet to the Sun and the eighth largest.
Mercury is the only body in the solar system known to have an orbital/rotational resonance with a ratio other than 1:1 (though many have no resonances at all).
Mercury is often visible with binoculars or even the unaided eye, but it is always very near the Sun and difficult to see in the twilight sky.
www.nineplanets.org /mercury.html   (1265 words)

Mercury was named by the Romans after the fleet-footed messenger of the gods because it seemed to move more quickly than any other planet.
Although Mercury is not tidally locked to the Sun, its rotational period is tidally coupled to its orbital period.
This image is a portion of the southwest quadrant of Mercury taken March 29, 1974, by the Mariner 10 spacecraft.
www.solarviews.com /eng/mercury.htm   (2295 words)

 Mercury (planet)   (Site not responding. Last check: )
Mercury ranges from –0.4 to 5.5 apparent magnitude ; Mercury is sufficiently "close" to the that telescopes rarely examine it.
Mercury was called Mercury when in evening sky but was known as Apollo —in honor of the Roman god of Sun when it appeared in the morning.
This is Mercury has zero axial tilt and esentially atmosphere to carry heat from its sunlit and it would thus always be dark the bottom of even a shallow crater at the planet's pole.
www.freeglossary.com /Mercury_(planet)   (1595 words)

 Mercury (planet) - Simple English Wikipedia
Mercury is the nearest planet in the Solar System to the Sun.
The planet is made up mostly of iron, which is very dense.
The planet is named after the mythological Roman winged messenger of the gods, because it orbits the Sun so fast.
simple.wikipedia.org /wiki/Mercury_(planet)   (197 words)

The innermost planet of the solar system and second smallest after Pluto; it is surpassed in size (but not in mass) by both Ganymede and Titan.
Mercury's perihelion precesses around the Sun at a rate that 19th century astronomers couldn't properly explain.
Mercury is the second densest major body in the solar system, after the Earth, pointing to a relatively enormous iron core with a radius of 1,800 to 1,900 km –; proportionately much larger than Earth's and making up most of the planet.
www.daviddarling.info /encyclopedia/M/Mercury.html   (880 words)

 PSR Discoveries: Hot Idea: Mercury Unveiled
Mercury is the smallest of the inner, rocky planets (Mars, Earth, and Venus) and the closest to the Sun.
This hypothesis also predicts that Mercury should have higher concentrations of elements that have very high boiling points (called refractory elements), such as calcium and aluminum, and not much of the elements that boil at low temperatures (called volatile elements), such as sodium and potassium.
A key feature of lava flows on many planets is a composition different from the surface the lava sits on, as shown by the maria on the Moon being darker and higher in FeO.
www.psrd.hawaii.edu /Jan97/MercuryUnveiled.html   (2149 words)

 Mercury - Crystalinks
Mercury is much too small for its gravity to retain any significant atmosphere over long periods of time, but it does have a very tenuous atmosphere containing hydrogen, helium, oxygen, sodium and potassium.
Mercury's precession showed the effects of mass dilation, providing a crucial observational confirmation of one of Einstein's theories - Mercury is slightly heavier at perihelion than it is at aphelion because it is moving faster, and so it slightly "overshoots" the perihelion position predicted by Newtonian gravity.
Unfortunately, the same face of the planet was lit at each of Mariner 10's close approaches, resulting in less than 45% of the planet's surface being mapped.The spacecraft made three close approaches to Mercury, the closest of which took it to within 327 km of the surface.
www.crystalinks.com /mercury.html   (3830 words)

 MESSENGER: MErcury Surface, Space ENvironment, GEochemistry, and Ranging
Among these, Mercury is an extreme: the smallest, the densest (after correcting for self-compression), the one with the oldest surface, the one with the largest daily variations in surface temperature - and the least explored.
Mercury's uncompressed density (what its density would be without compaction of its interior by the planet's own gravity) is 5.3 grams per cubic centimeter, by far the highest of all the terrestrial planets.
Mercury's axis of rotation is oriented nearly perpendicular to the planet's orbit, so that in the polar regions sunlight strikes the surface at a constant grazing angle.
messenger.jhuapl.edu /why_mercury   (1829 words)

 The Solar System: Mercury
Mercury is the innermost planet in our solar system, and it is not the easiest of planets to observe from earth as it is small (diameter = 4878 km / 3030 miles).
Mercury, the planet nearest the Sun, is the second smallest planet in the solar system.
Mercury is one of the five planets known to the ancients.
www.cdli.ca /CITE/ss_mercury.htm   (435 words)

 NASA - Mercury
Because of Mercury's size and nearness to the brightly shining sun, the planet is often hard to see from the Earth without a telescope.
The planet is about 28,580,000 miles (46,000,000 kilometers) from the sun at its closest point, and about 43,380,000 miles (69,820,000 kilometers) from the sun at its farthest point.
The planet is usually not visible at this point because Mercury and the Earth orbit the sun at different angles.
www.nasa.gov /worldbook/mercury_worldbook.html   (1493 words)

 Mercury - A planet of extremes
Mercury is a lump of rock, barely larger than the Moon, living under the fierce heat of the burning Sun.
It has been known for centuries that Mercury revolves around the Sun once every 88 days, and for a long time it was thought that length of a day was the same.
This century scientists bounced a radar beam off the planet and found the true period to be 58.6 days, exactly two-thirds the orbital period.
www.solarsystem.org.uk /mercury   (342 words)

 Mercury - EnchantedLearning.com
Mercury's orbit is very eccentric; at aphelion (the point in the orbit farthest from the sun) Mercury is 70 million km from the sun, at perihelion Mercury is 46 million km from the sun.
This is the symbol of the planet Mercury.
Mercury Cloze Printout: A fill-in-the-blanks activity on the planet Mercury.
www.enchantedlearning.com /subjects/astronomy/planets/mercury   (631 words)

 Solar System Exploration: Planets: Mercury
The small and rocky planet Mercury is the closest planet to the Sun; it speeds around the Sun in a wildly elliptical (non-circular) orbit that takes it as close as 47 million km and as far as 70 million km from the Sun.
Mercury completes a trip around the Sun every 88 days, speeding through space at nearly 50 km per second, faster than any other planet.
Because Mercury is so close to the Sun, it is hard to see from Earth except during twilight.
solarsystem.nasa.gov /planets/profile.cfm?Object=Mercury   (169 words)

 Space Today Online - Exploring the planet Mercury
A baked stone of a planet where life would be close to unbearable, Mercury is the planet nearest to the Sun and the eighth largest planet.
Mercury was the god of commerce, travel and thievery in Roman mythology.
Mercury's interior probably is dominated by that large iron core whose radius would be 1118-1181 miles.
www.spacetoday.org /SolSys/Mercury/MercuryBackground.html   (1267 words)

 ORRERY: Mercury - closest to the sun
Mercury is the closest planet to the Sun.
Its orbit is said to be "inferior", as it lies between the Sun and the Earth.
Mercury is the densest of all the planets, with a large iron core.
www.harmsy.freeuk.com /mercury.html   (426 words)

 StarDate Online | Solar System Guide | Mercury
Tiny, cratered Mercury is the closest planet to the Sun.
Mercury is only about six percent as massive as Earth, but it is about the same density.
The reason remained a mystery until 1915, when Albert Einstein used his new theory of gravity, General Relativity, to correctly predict Mercury's orbit -- and explained the reason for previous errors: Mercury is so close to the Sun that its orbit is affected by the "warp" in space created by the Sun's powerful gravitational field.
stardate.org /resources/ssguide/mercury.html   (825 words)

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