what is the size of Mars compared to Earth?
546930
The diameter of Mars at its equator is 6,794 kilometers (4,222 miles), compared to Earth's 12,756 kilometers (7,928 miles).  This is 53% of Earth's size.\n\nIt also has about 30% of Earth's gravity, 11% of Earth's mass, and 1% of Earth's atmospheric pressure.  Oh, and it has 0% of Earth's population, but that statistic is the most likely of any of them to change.
929196
I feel the question should be what is the circumference of earth -\nIt is -\nThe average radius of the Earth is 3,959 miles (6,374 kilometers).\nThe equitorial diameter of the Earth (distance from one side of the Earth to the other at the equator) is about 7,926 miles.\n\nThe ratio of the circumference to the diameter of a circle (circumference/diameter) \nis written as the symbol pi. \nPi is approximately 3.141592.\n3.14159265\n3.1415926535\n\nTherefore, to determine the circumference from the diameter given above:\nequitorial diameter x 3.141592 = equitorial circumference\n| |\n7,926 x 3.141592 = 24,900\n| |\nThe earth has a circumference of approximately 24,900 miles.\n\n\nMore precisely the circumference of the earth (or distance around earth)\nat the equator is 24,902 mi / 40,076 km. \n\nso the answer is 24,902 miles or 40,076 kms.
553832
Mars is the fourth planet from the Sun and the seventh largest: \n\n      orbit: 227,940,000 km (1.52 AU) from Sun\n      diameter: 6,794 km\n      mass: 6.4219e23 kg\n\n\n Mars (Greek: Ares) is the god of War. The planet probably got this name due to its red color; Mars is sometimes referred to as the Red Planet. (An interesting side note: the Roman god Mars was a god of agriculture before becoming associated with the Greek Ares; those in favor of colonizing and terraforming Mars may prefer this symbolism.) The name of the month March derives from Mars. \n\nMars has been known since prehistoric times. Of course, it has been extensively studied with ground-based observatories. But even very large telescopes find Mars a difficult target, it's just too small. It is still a favorite of science fiction writers as the most favorable place in the Solar System (other than Earth!) for human habitation. But the famous "canals" "seen" by Lowell and others were, unfortunately, just as imaginary as Barsoomian princesses. \n\n\nViking 2 Landing Site  Pathfinder Landing Site The first spacecraft to visit Mars was Mariner 4 in 1965. Several others followed including Mars 2, the first spacecraft to land on Mars and the two Viking landers in 1976. Ending a long 20 year hiatus, Mars Pathfinder landed successfully on Mars on 1997 July 4. In 2004 the Mars Expedition Rovers "Spirit" and "Opportunity" landed on Mars sending back geologic data and many pictures; they are still operating after more than a year on Mars. Three Mars orbiters (Mars Global Surveyor, Mars Odyssey, and Mars Express) are also currently in operation. \n\nMars' orbit is significantly elliptical. One result of this is a temperature variation of about 30 C at the subsolar point between aphelion and perihelion. This has a major influence on Mars' climate. While the average temperature on Mars is about 218 K (-55 C, -67 F), Martian surface temperatures range widely from as little as 140 K (-133 C, -207 F) at the winter pole to almost 300 K (27 C, 80 F) on the day side during summer. \n\nThough Mars is much smaller than Earth, its surface area is about the same as the land surface area of Earth. \n\n Olympus Mons Mars has some of the most highly varied and interesting terrain of any of the terrestrial planets, some of it quite spectacular: \n\nOlympus Mons: the largest mountain in the Solar System rising 24 km (78,000 ft.) above the surrounding plain. Its base is more than 500 km in diameter and is rimmed by a cliff 6 km (20,000 ft) high. \nTharsis: a huge bulge on the Martian surface that is about 4000 km across and 10 km high. \nValles Marineris: a system of canyons 4000 km long and from 2 to 7 km deep (top of page); \nHellas Planitia: an impact crater in the southern hemisphere over 6 km deep and 2000 km in diameter. \nMuch of the Martian surface is very old and cratered, but there are also much younger rift valleys, ridges, hills and plains. (None of this is visible in any detail with a telescope, even the Hubble Space Telescope; all this information comes from the spacecraft that we've sent to Mars.) \n\n Southern Highlands The southern hemisphere of Mars is predominantly ancient cratered highlands somewhat similar to the Moon. In contrast, most of the northern hemisphere consists of plains which are much younger, lower in elevation and have a much more complex history. An abrupt elevation change of several kilometers seems to occur at the boundary. The reasons for this global dichotomy and abrupt boundary are unknown (some speculate that they are due to a very large impact shortly after Mars' accretion). Mars Global Surveyor has produced a nice 3D map of Mars that clearly shows these features. \n\nThe interior of Mars is known only by inference from data about the surface and the bulk statistics of the planet. The most likely scenario is a dense core about 1700 km in radius, a molten rocky mantle somewhat denser than
767312
Mars takes 688 Earth days to orbit the Sun once.  This is a bit less than two Earth years (730 days), or not quite 6% less.  So about ten orbits, depending on when in 1987 you want to count from..
144163
"Earth's bulge also makes the circumference of Earth larger around the equator than around the poles. The circumference around the equator is 24,901.55 miles (40,075.16 kilometers), but around the poles it is only 24,859.82 miles (40,008.00 kilometers). The circumference is actually greatest just south of the equator, so Earth is slightly pear-shaped."
619435
Hi ... The diameter of Mars is 4228.4 Miles ... follow the link below for loads more info ... Hope this helps !!!
220923
not sure about the mass and size, i always thought mars is bigger than earth? just are you sure your questions are sensible coz as far as i remember, we on earth are still trying to figure out how to get there.
561687
Dave_Stark\n23 seconds ago\n\n\n \n The average distance from Mars to the Sun is 1.52369 astronomical units. One astronomical unit (AU, the average distance from the Sun to the Earth) is 1.49597870E11 meters.\n\nConverting those numbers, then, means that Mars is:\n\n1.52369 * 1.4959787E11 meters = 2.27941E11 meters, or, converting into English units:\n\n141,635,833 miles (on average -- remember that the orbits of the planets around the sun are not circular, but elliptical)
486442
It will cost about $1 billion to get to Mars. The atmosphere is carbon dioxide. You can't breathe it. There is no weather on Mars. THe Size of MArs is about one-eighth the size of Earth.
38199
sorry no answer.  but i was wondering?  How is Mars this time of year?
52462
This would depend on where the Earth and Mars are in their orbits.  \n\nIf Earth and Mars are on opposite sides of the Sun then they could at most be: 234 million miles away.\n\nIf on the same side of the Sun and lined up with the Sun then they could be as close as 47 million miles. \n\nI got the following number today from a computer program for the distance based on today's position of Mars: 94.3 million miles.
65671
The Mean Density of Mars is: 3.934 g/cm3
774696
probably in planet mars
658807
Check the following links to know more about Mars.\n\nFollow links on these pages to have  a better insight on The Universe!
462021
It doesn't GET any bigger than it is, it just LOOKS bigger because it really IS nearer\n\nBecause its distance from the earth varies as the orbit is not a circle, as you asssume, but an ellipse (oval).\n\nThe furthest distance from the earth that the moon reaches in any orbit (lunar month) is called the APOGEE and the nearest distance it approaches in that orbit is the PERIGEE.\n\nIn the table below the distances are in kilometres, measured from the centre of the earth to the centre of the moon.\n\nJust gone:\n\nMar 13  APOGEE 406272 km \nMar 28  PERIGEE 359169 km\n\nComing up soon:\n    \nApr  9 APOGEE 405549 km    \nApr 25 PERIGEE 363735 km  \n\nThe earth's orbit round the Sun is an ellipse too, and the nearest distance in any one orbit (year) is called PERIHELION and the furthest distance in that orbit is called APHELION.\n\nHelios is the Greek word for the sun and Peri- and Ap- are prefixes meaning near to and far from. The sun looks correspondingly smaller at aphelion and larger at perihelion.  \n\nSometimes eclipses of the sun are not quite total if the sun is bigger than usual (near or at perihelion) and the moon smaller than usual (near or at apogee).\n\nThere is a more pronounced variation in the distance between Earth and Mars than either the variation in Sun-Earth or Earth-Moon distances. Mars looks a lot brighter and a lot dimmer as a consequence, at these times.\n\nTo visualise why, think of a clock face. The sun is in the middle of the dial. The earth is on the tip of the hour hand and Mars is on the tip of the minute hand. When the time on the clock face is midnight, five past one, ten past two etc earth and Mars are at their closest. When the time on the clock face is 12.33, 1.37, 2.43 etc Earth and Mars are at their furtherst apart, Mars being the radius of an earth orbit plus the radius of a Mars orbit away, beyond the Sun.\n\n(This too-simple model assumes circles not ellipses and assumes that Mars years are twelve Earth years, where in reality Mars years are only about twice an Earth year. But it gives you a general idea.)
14152
The circumference of the earth at the equator is 24,901.55 miles (40,075.16 kilometers).\n\nBut, if you measure the earth through the poles the circumference is a bit shorter - 24,859.82 miles (40,008 km). This the earth is a tad wider than it is tall, giving it a slight bulge at the equator. This shape is known as an ellipsoid or more properly, geoid (earth-like).
1130891
Equatorial circumference of the earth is 40,075.2 km which is\n40,075,200,000mm\nMeridional circumference of the earth is 40,007.86 km wich is\n40,000,786,000mm