Why does the moon sometimes have a ring around it?
147868
Moon ring:\nhttp://home.hiwaay.net/~krcool/Astro/moon/moonring/\nhttp://www.ics.uci.edu/~eppstein/pix/josh3/MoonRing.html\nhttp://www.nasa.gov/worldbook/moon_worldbook.html
56064
the moon rotates around the earth and the earth rotates around the sun, and the earth rotates on it's axis.  sometimes that places the moon on the 'daytime' side of the earth.  depending on where it is relative to the sun that day, we'll see a crescent moon, or half moon—sometimes we won't even see the moon though it's there.\n\nimagine you are the earth and you are holding a heavy ball (the moon) on a rope and spinning around in a circle fast enough to see the ball up in front of you, while at the same time walking in a circle around a house (the sun).  quite often, you would see both the ball and the house at the same time.\n\n//
394180
It has to do with refraction due to different densities of air-in cooler climates, there tends to be much warmer air near the surface, with colder air in higher altitudes, plus the colder air is much more dense, so acts like a magnifying lense- The very largest moon-views are always seen close to the horizon because of this.
790340
Beacause asit goes around the Earth it becomes closer and further away during its cycle.  The moon is in an oval orbit.\nhttp://stardate.org/nightsky/moon/
1036855
Depends on atmospheric conditions ,small water droplets form into ice crystals in the upper atmosphere. The moon reflects light into these droplets causing refraction of that light, givind a halo effect sometimes even a 'luna rainbow'
148845
This is when the moon is in front of the sun in respect to the earth. It is also called conjunction.
91665
Its more of an elispse, not perfectly round due to the gravitational pull of the oceans by the moon and due to mountains.
310923
It's orbit is closer to a circle than any other with an eccentricity of less that 1%. It also has a retrograde motion (it rotates from east to west instead of west to east). It always shows the same face to earth in the same way the moon does.
429788
The sun radiates light, thus it is emitted all around it. The moon reflects light from the sun, thus only the area facing the sun will be light.
768438
The main reason is that there is no weather on the moon to erode the surface.  Additionally, there is no tectonic movement of the surface of the moon.  Because of both these things, the surface of the moon is stable, while the earth's surface is constantly being altered.
730462
It's due to gravity. \nThe Moon Tide\nThe earth and the moon are two great masses that have a significant gravitational pull on each other. This is what keeps the moon in orbit around the earth, and it is also what causes tides to occur in the ocean. Picture the earth with a uniform level of water all around it.  The moon’s gravity pulls on the earth, and pulls the water towards it. The water moves up into a slight bulge on the side of the earth that faces the moon. At the same time, there is a force pulling water out in the opposite direction of the moon.\n\nCheck this link.\n\n\nIt will answer all your questions.\n http://oceanlink.island.net/oinfo/tides/tides.html
301180
Also, we only see it when it is above the horizon.\n\nDuring the day, the sun is obviously above the horizon.  But the moon sets an hour or so later each day, so sometimes it is below the horizon in the day, and sometimes not.
225823
Here on earth, we have a layer of gases surrounding us. The layer is called atmosphere. The gas is called air which is actually a mixture of many gases. The properties of the atmosphere varies according to height. Earth has her own atmosphere because she has enough gravity to attract all the things towards the center. But the Moon has a lower mass than that of earth. So, the gravitational pull is not enough to hold the atmosphere. You might have spied many fireballs or meteors in a starry night. They are big ball of rocks. When they come in the atmosphere they are burnt due to friction with the air. So, when they hit the ground they're most likely to be burnt to ashes. But, as Moon has no atmosphere, the rocky meteor-balls hit the ground without any interruption. So, moon's surface is filled with uncountable craters due to absence of an atmosphere.
1079025
no it is a reflection of the suns light.  That is why you can still see the moon during the day soemtimes.  It is still getting light from the sun.
968800
It is the shadow of the Earth or rather, the part you see is the part that is not in the shadow of the Earth.\n\nThe shape the moon appears depends on its position relative to the Earth and the Sun. Depending on the timing, the shadow the Earth casts on the moon will change.\n\nSince the orbits of the moon and earth are constant, astronomers thousands of years ago have been able to predict the shape of the moon depending on the date.
1087183
The moon has a side that always faces us! That's not always filled with light though. That's why we have phases of the moon.
821694
It's round because it has enough gravity to make it round, the force of gravity crushing away irregularities until a round shape is achieved. There's actually a limit in astronomy, anything with more mass then a certain amount will as a rule be round.\n\nAs for the holes, I assume you mean the craters. They are there because we're basically living in a shooting gallery of asteriods, comets, and meteors. On the moon there are no erosive forces so when one hits it the impact crater remains.