why there is no gravity on the moon?
954663
it has gravity indeed, but less than earth\n\n:> peace\n.
1137321
Landing spacecraft depends strongly on the properties of the body that is being landed on. Let's compare some of the possibilities. Earth has strong gravity and a thick atmosphere; the moon has no atmosphere and gravity 1/6 as strong. An asteroid would have no atmosphere and very weak gravity. Gas giant planets have no surface; you can drop probes into them but you can't land. They also have very strong gravity and intense storms.\n\nReturning to Earth involves aerobraking (using the outer atmosphere to slow down, which makes a lot of heat) followed by air-slowed descent (parachutes, or wings on a Space Shuttle). Landing can be on wheels on the ground (Shuttle), in air bags on the ground (Stardust probe), or splashing down at sea (Apollo).\n\nLanding on Earth's Moon requires coming to a complete stop with rockets, against a fairly strong gravity field. There is no need for a heatshield without an atmosphere, nor is there any need to streamline the lander. It's a very different experience from landing on Earth, and the equipment and techniques are completely different.
837272
atmosphere is created when gravity holds all the gas molecules around it, like earth's gravity is holding all the nitrogen/oxygen/water vapor/etc around it.  since the moon doesn't have as much gravity, it can't hold in the same atmosphere.  the atmosphere and humidity around a planet also absorb and hold heat.  when the sun sets on earth, the temperature doesn't change drastically, even though the sun's not providing heat anymore, because the atmosphere is hanging on to the heat it absorbed during the day.  if there is less atmosphere to absorb the heat, once the sun goes down the temperature will drop drastically.\n\nI'm not sure about the craters, but my guess is that the moon is more cratered because there's no erosion.  on a planet like earth, water and wind constantly wash across the surface and erode any irregularities like craters, so the surface is relatively smooth.  on the moon, there's no water and no wind (no atmosphere = no wind), so there's no erosion to smooth out the craters.
240475
If people couldn't go to the Moon then the Space Shuttle would be impossible also. So.\nThere is no wind because there still in space, just standing on the Moon. \nWe're not in space because we have an atmosphere.\nThe shadows don't line up because if they did that would mean that have a magic perspective eliminating Sun.\nWhen the sun peeks out of low clouds near sunset the rays are obviously not parallel. Why should they be on the moon?\nAnd what studio lights are magic too?\nThey don't bounce high enough because they weigh 300 pounds \non Earth with their suit and all. So 50 pounds on the moon.\n3 times lighter not 6.\nThey never sent people back because it would cost $100 bil to do now and they didn't see the point.\nThe flag stays up because there was a wire in it.\nThe flag jiggled for a few seconds after the astronaut takes off his hand because there's no air to dampen it's vibrations. Imagine a hanging metal sign being pushed and FF it.\nThe flag fell down with the blast from the rockets to take off. And how do you expect to see a flag less than 1 inch thick and 1 foot wide from 240,000 miles away when you can hardly see details on a PLANET(pluto) at the edge of the solar system. There is just one manmade object visible on the Moon as a speck in the world's largest telescopes. the entire spaceship of one of the missions.So yes you kindof can see them.
958106
Since the Moon's gravity is only one sixth that of the Earth, much less fuel is needed to launch from the Moon than from the Earth, assuming the mass launched from each is the same.\nOf course the Moon would not be visible.  It does not make its own light, because its just a big rocky ball.
315226
because all of these facts can be proven scientifically...it is just a matter of fact that all bodies are attracted to one another with equal and opposite forces.... but the larger the mass the more attraction there is and with gravity the sun has enough mass to keep the earth falling toward it and the earth has enough mass to keep the moon falling toward it and these same forces keep us from flying off the earth.....if you took some physics and chemistry classes it may start to make sense to you but you may still question it until you have taken calculus classes that put out the math to prove it so if you are interested in this maybe you should pursue it more it is all very interesting
229644
Seems how the moon has no water...I think the earth has more
1083316
No.None of the pubs on the moon would have any atmosphere.
955624
If it wasn't for gravity, there would be no earth.  (Gravity holds the earth together.)  \n\nThe very notion of "up" and "down" *needs* gravity, or it has no meaning.  The very notion of "down" has always meant,  "in the direction of gravity", even before we knew what gravity was.  If you are in a room with no windows, how do you know which way is "down"?  Because "down" is THE DIRECTION THAT THINGS FALL.  When you stand up, it's THE DIRECTION OF YOUR FEET.  Without gravity, there is no notion of falling, and no notion of "standing up" so "down" (and "up") have no meaning.  Think of astronauts in a room with no windows on the Space Station.  They have no "up" or "down". \n\nOr think of it another way.  The notion of "up" and "down" has less to do with the direction of the earth, as with the direction of gravity.  If you are standing on the moon, or on mars, which way is "down"?  It will be in the direction things fall ... towards the planet you are standing on.  So "down" is defined relative to the current direction of gravity, regardless of what is causing that gravity.\n\nSo the earth has no "up" and "down" except with respect to gravity.  It also has no "top" or "bottom" ... the North Pole is not the top of the earth.  We just like to make maps that way, but there's no scientific reason for it.    (The Egyptions drew maps relative to the Nile river ... so the "upper Nile" is South, and the "lower Nile" is North.)
1043150
Your body still has the same mass so your weight would not change.  However, there is a difference due to gravity.  The Ground Reaction Force (based on Newton's Third Law of Motion) would change due to the surface area to which gravity is applied.  This is the basic principle why astronaut's weigh less on the moon than on Earth because of the amount of gravity.  So yes, if you slouch you would weigh more because of gravity but it would be such a small amount of difference that it wouldn't be measurable on a standard scale.
1031159
They are called moonquakes.  If the moon had an atmosphere it probably would not be able to keep it or hold it at the moon's surface due to little gravity.  (only 1/6 of earth's)
274942
Because the environment in space is so very different from down here. There is no air in space and there is no liquid water in space. Both have huge impacts on the minerals, and the shape of the mineral grains, we find here on earth as opposed to minerals we find in meteorites and in moon rocks. \n\nFor example: the surface of the moon is covered with an extremely fine dust called regolith. It is composed out of microscopic chards of glass. Such materials cannot exist on earth for any longer periods of time as they would simply be dissolved in water. Glass doesn´t dissolve easily in water but the regolith particles are so tiny they would be dissolved eventually. If they could even be formed that is. It is produced on the moon by meteor impacts that melts portions of the moon rock and throws that melt out to form tiny particles. Earth has its atmosphere which would prevent the formation of particles that small and irregular. Glass particles formed from volcanic eruptions on earth become more rounded, more symmetrical and much larger than regolith because of its interaction with the air. Also moon rock is absolutely bone dry. There is no trace of water or minerals containing water. There are no volatiles at all. No carbon, no nitrogen, no nothing. Moon rocks are very extraterrestrial to us.
320636
technichally speaking, if the earth were hollow, we wouldn't have gravity. If the earth is hollow, then where do we get volcanoes from? Figure it out.
561101
gravity, even though the moon is that far away the gravity of themoon and the earth cause the tides.
709333
The moon's gravity causes tides, which is not quite the same thing. A "tidal wave," or tsunami, is caused by an earthquake.\nBecause distance is an central factor in gravity, the part of the global ocean that is closest to the moon at any given moment will bulge outward ever so slightly toward the moon. On the opposite side of the earth, the water farthest away from the moon will bulge in the opposite direction, being less influenced by that same gravity. Those two regions will then experience high tide. Halfway between them will be the two areas of low tide.\nAs the earth rotates, each part of the surface eventually passes through each of these gravitational regions, thus experiencing two high tides and two low tides each day.\nThe sun has some influence on tides as well, but its distance from the earth lessens its impact. However, when the sun, moon and earth are in alignment, the combined forces result in unusually high and low tidal patterns.
694597
The Moon essentially has no atmosphere, as its gravity is too weak to hold onto an atmosphere, given the Moon's temperature.\nThe Moon lacks a magnetic field.  There are some isolated areas with hints of magnetism, probably from nickel-iron asteroids impacting.\nThe regolith is thick enough that no one had drilled through it,. but probably a few hundred miles.\nChemically the Moon is depleted in hydrogen, oxygen, nitrogen, and the elements from iron and higher.  It is enriched compared to Earth in calcium, silicon, magnesium, manganese, and others.  See wikipedia's essay on the Moon.\nPhysical state is solid.
144940
There is no atmosphere on the moon, therefore no wind, therefore leading s to believe it is a hoax and a conspiracy.