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Q: Why does mercury have much less mass than mars?
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Does mercury have more mass than venus?

No, it has much less mass.


How is gravity about the same on Mars and Mercury?

This does seem odd. Mars, with a mass that is about twice the mass of Mercury, has about the same surface gravity. Mars' mass is about .107 the mass of earth, and the mass of Mercury is about .055 the mass of earth. The surface gravity on Mars is about .38 times the surface gravity of earth, and the surface gravity of Mercury is about .38 times the surface gravity of earth as well. The difference is that the mean density of Mercury is about 5.43 grams per cubic centimeter, and the mean density of Mars is about 3.93 grams per cubic centimeter. Mercury is quite a bit more dense, so if you stand on Mercury you are much closer to the center of gravity of the planet. Mercury has a tiny slightly bit more gravity than mercury though.


How does your weight change while on a different planet?

Your weight, or any objects weight, is a function of your mass and the local gravitational force. Planets such as Mars and Mercury, or even the moon have much lower gravity, since these bodies are smaller and less massive. So your weight will be less, though your mass will remain the same. I will still be a 100kg man (my mass), but on Mercury I will weigh 38kg.


Is Mercury's gravity pull to little?

If compared to earth, mercury has little gravity pull as its mass is much less than earth's mass.


What inner planets have atmospheres?

3 Venus,Earth,and Mars (Mercury doesn't have much of an atmosphere there is to less gravity)


What is the planet with the lowest escape velocity is?

Mercury is the smallest planet, and as a consequence has the smallest gravity. Mars is not as dense as Mercury, but is so much larger--it has the second lowest surface gravity. Eris (which is larger than Pluto), has less gravity than Mercury, but it along with Ceres and several other large solar system objects are considered "dwarf" planets.


Does mars have stronger grtavity than earth or weaker?

Because Mars is a lot less massive than the Earth. The surface gravity depends on the mass of the planet you are standing on, and since Mars is lighter the surface gravity there will be less than here on Earth.The gravitational force between two objects depends on their mass and the distance between their centers of mass. Mars has a smaller radius than the Earth (which would tend to increase the gravitational force), but it has a much smaller mass than the Earth (which tends to decrease the gravitational force). Combining the two factors, it works out that the surface gravity of Mars is about one-third that on Earth.


Is planet Mars the densest planet?

Not at all. Mars is the least dense of the rocky planets. Earth is the densest planet in the Solar System because of its large iron core. Mercury and Venus are only slightly less dense.All of the Gas giants are much less dense than the rocky planets. The least dense, Saturn, is actually less dense than water. (All of the gas giants have a much greater mass than the rocky planets but density is mass divided by volume)


Which planet are you the lightest on?

Saturn is the least dense, but Mercury has the lowest mass.


When mercury is the smallest planet why does it have gravity that matches mars which is larger?

Gravity depends on two factors: the mass of an object and the distance from the center of gravity. Mass is a measure of how much matter is in an object. In a uniform gravitational field mass is directly proportional to weight. Mercury has less mass than Mars does but it is also denser , meaning more mass is compacted into a given amount of space, so an object on the surface is closer to the center of mass. In more accurate terms, gravity is directly proportional to the mass of the object exerting it. If you double the mass you double the strength of gravity. By contrast, the strength of gravity is inversely proportional to the square of the distance. If you double your distance you will experience one quarter the gravity. Mars is 1.388 times the diameter and 1.94391 times the radius of Mercury. If you do the math with these numbers you will find that the resulting surface gravity is nearly the same between the two.


Is there a connection between the mass of a planet and how many moons it has?

The mass of a planet has nothing to do with its number of moons. For instance, Mars' mass is much less than that of Earth, yet Mars has two moons (Deimos and Phobos) while the Earth has one. (Luna)


Does Venus and mercury spin faster then earth and mars?

Venus and Mercury rotate slowly, much more slowly than Earth or Mars.