By radiation. The moon radiates electromagnetic energy, as does just about anything warmer than absolute zero.
The farther away from the Earth's surface, the less dense the air will be. Of course, once you break out of the atmosphere, there will be no air around you.
Of the four inner planets, Venus - pressure at the surface is about 95 times the pressure on Earth. The gas giants, however, don't have a surface like Earth; the atmosphere just keeps getting denser and denser as you go down. Probably the answer is "Jupiter", it being the largest of the gas giants.
Mars has a thinner atmosphere than earth but currently it's still able to have storm systems like wind and dust storms. Mars may have had an atmosphere as dense as Earth's at one time. On November 21, 2008, however, researchers announced new evidence that the atmosphere of Mars was and is still being stripped away by the Solar Wind.
The lack of atmosphere means there is no wind, or rain, etc. to either erode or wash away the footprints. The only way for the footprints to be disturbed would be from an impact event, such as a meteor striking the moon's surface near the prints and disturbing the surface.
Because of the Earths atmosphere, the distance from the Sun, does not affect the temperature on the surface of the Earth. In the northern hemisphere, we are closer to the Sun in winter and the furthest away in summer.
Thermosphere, it is also the atmosphere with the highest temperatures.
Air density is higher near the surface of the Earth. As you climb away from the surface, the pressure decreases.
As you rise up through the atmosphere, there is less of the atmosphere above you to press down on you. Thus less pressure.
Pluto's surface pressure is said to be 6.5-24 ubar. The atmosphere tends to freeze and fall away from the Sun's direction.
Most of the time, a light ray passing through the atmosphere in any direction curves away from its original direction toward the earth's surface. Occasionally, light can proceed straight through the atmosphere with no change in direction. Rarely, it can bend away from the surface.
Pluto's atmosphere consists of a very thin surface of methane, nitrogen, and carbon monoxide, made from the ice on its surface. As Pluto moves away from the Sun, its atmosphere gradually freezes and falls to the ground. As it gets closer to the Sun, the temperature of Pluto's surface increases, causing the ice to turn into gas. This creates an "anti greenhouse" effect cooling the surface of Pluto.
With a higher altitude, there is a lower air pressure. This is caused by gravity pulling the gas molecules of our atmosphere closer to its surface. when the molecules are farther away from the Earth's surface the gravitational pull is weaker thus making the atmosphere thinner higher up and thicker closer to the surface.
The surface of Mercury is a bit like that of the moon. There is no real atmosphere as the planet is too close to the sun and is not massive enough. It is pitted with billions of craters, from meteor impacts, though as there is to atmosphere, there is no weather to errode the features away over time.
because there is no atmosphere which means no wind so there footprints cant be blown away.
The farther away from the Earth's surface, the less dense the air will be. Of course, once you break out of the atmosphere, there will be no air around you.
Planet Mercury's Surface pressure is almost none existent. This is due to its low gravity and extremely thin atmosphere that has been blasted away by solar winds.
It's gravity that holds it down. Also it's a very thick atmosphere with surface pressure of 95 atmospheres.