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The Moon

The Moon is the only natural satellite of the Earth, and the only celestial body where humans have landed. It is approximately 384,403 kilometers (238,857 miles) away from the Earth, and has an approximate diameter of 3,476 kilometers (2,160 miles).

500 Questions

Does the earth have a face?

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The Earth does not have a commonly acknowledged face such as is present in the popular notions of the lunar surface visible from Earth, and which is attributed to the phenomenon of pareidolia, or the perceiving faces in things which are really inanimate objects. This man on the Moon's eyes are caused by the darker lunar basins or seas, including Seas of Serenity, Rain, Vapors, and Clouds for the eyes mouth and nose.

Earth can be and often is metaphorically said to have a face in common usage of language to describe relative positions of features - for example, the side facing the Sun etc., but these are no more prevalent than the convenient usage for any other object with a notional face.

Does the sun have any moons?

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no its doesnt have any moons. because its to hot for it but they consider the planets to be the suns moons

Does the moon spin on its own axis?

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YES!!!

However, the spin is very slow, much slower than the Earth.

In the 1 month (28/29 days) that it orbits the Earth, it only rotates once.

Consequently, people on Earth only see one face.

It has been calculated that the Earth only sees 59% of the Moon's surface. The other 41% has always been hidden from the Earth.

How many days did it take the isrealites to go though the wilderness?

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Scholars calculate the Israelites to have wandered in the wilderness for 38 or 39 years; tradition holds it was "40 years" although that number may be an ancient metaphor for a generally large number and hence simply meaning, a long time although an actual forty years would still be pretty accurate. According the the Old Testament, Moses led them out of bondage from Egypt, Joshua helped lead them into the promised land.

What is the sea of tranquillity and why is it famous?

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The Sea of Tranquility, or Mare Tranquillitatis, is a darker basin on the lunar surface made famous because it was the selected location for landing of the first manned mission to the Moon; during Apollo 11, astronauts Neil Armstrong and Buzz Aldrin landed there, becoming the first people to visit another celestial body.

What the phase that results when the moon is on the opposite side of the earth from the sun?

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Q1. What causes a solar eclipse to occur?

Q2. What time of the day are you likely to see a waning recent moon most directly overhead?

Q3. How long does it take the earth's rotation axis to complete one full precession cycle?

Q4. How do the seasons in the northern and southern hemisphere compare?

Q5. What is the phase of the moon when the moon is between the sun and the earth?

Q6. What must be the phase of the moon for a solar eclipse to occur?

Q7. What is the phase of the moon that occurs halfway after the full moon and before the new moon?

Q8. What is the phase of the moon that occurs after the waxing quarter and before the the full moon?

Q9. What must be the phase of the moon for a lunar eclipse to occur?

Q10. What is the orientation of the earth during the summer solstice in the northern hemisphere?

Q11. What is the umbra of a planet or moon?

Q12. What is the phase of the moon that occurs halfway after the new moon and before the full moon?

Q13. What causes the lunar eclipse to occur?

Q14. What is the orientation of the earth during the spring and fall equinoxes?

Q15. What is the penumbra of a planet or moon?

Q16. What is the phase of the moon when the moon is on the opposite side of the earth fro the sun?

What do you call it when the moon changes its shape?

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The apparent change in the sunlit portion of the moon through the month is called waxing (getting larger, from crescent through full) or waning (getting smaller, from full down to crescent).

How much would a 70 kg man weight on the moon in Newtons?

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Mass experiences about 1.62 Newtons per kilo on the lunar surface. Hence a 70 kg man would "weigh" only 113.4N.

What is the speed of gravity on earth?

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The speed of gravity can not be measured because it does not move instead it is a field denting space and time

Gravity does not have a speed but at the Earth's surface it produces an acceleration of 9.08 metres per second per second on a falling object. In other words an object that is dropped will after one second be travelling at 9.08 m/s

What is the scientific explanation of the moon's absence?

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The moon doesn't always rise and set at night, sometimes it rises and sets during the day.

This is dependent on the phase of the moon.

The moon circles the earth once every 28 days.

The closer to full the moon is, the more hours it spends in the sky at night, because it is on the opposite side of the earth as the sun. That's why it is full - the sun is behind you, lighting the moon in front of you. A completely full moon will rise as the sun sets, and set as the sun rises, and will be visible all night.

The closer to "new" the moon is, the fewer hours it spends in the sky during the night, and the more time it spends during the day because it is on the SAME side of the earth as the sun. It appears "new" because the sun is behind it, lighting the far side of the moon. A completely new moon will rise and set with the sun, and will only be visible in the day.. or briefly at dusk.

A half-moon is up half the day and half the night. If you don't see a half-moon at night, it has either already set or hasn't risen yet.

The different shapes of the moon seen from earth are called?

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Moon Phases , or Lunar Phases.

What is a big hot ball of gas that gives off its own light?

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A star. The nearest star to Earth is the SUN.

Is the moon closer to earth than any planet?

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there is a moon for every planet

Who has stood on the moon?

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neil Armstrong and Buzz Aldrin

What type of tide occurs during the quarter moon phases?

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The exceptionally low high tides (and high low tides) that occur during the quarter-moon phase are known as "neap tides." Conversely, the exceptionally high and low tides that occur during full and new moons are known as "spring tides."

Strictly speaking, however, although there is a correlation between moon phase and tidal activity, this is not truly due to the moon. Tides are caused by the moon's orbit around the earth; the moon's gravity pulls a swell of water on the the side of the earth facing it, and a corresponding bulge on the opposite side. These vary several times per day, with the moon's once-daily orbit of the earth. So, there are about 12 hours between high tides.

Moon phases, on the other hand are purely a visual phenomenon, varying based on the the viewing angle of the moon from our vantage point, here on earth, relative to the sun. When the sun is shining behind the moon, we observe a new moon. On the front side? A full moon. When the earth, moon, and sun are aligned at roughly a 90 degree angle? A half moon. And, of course there's every phase in between. During any given day during the cycle, the tides continue to rise and fall independent of what lunar phase we happen to observe.

The spring and neap tides are actually caused by the sun. Like the moon, the sun also exerts a gravitational pull on the side of the earth that faces it, causing high tides every twelve hours -- solar tides; Although this effect is far weaker than the lunar tides (about half the effect), the height of the tide at any given time is a composite of the gravitational vectors of the sun and moon, added together, like constructive or destructive interference. Thus, when the sun and moon are on the same side of the earth (or opposite sides), their collective gravity works together and magnifies the effect, and tides are higher and lower than usual; this is what occurs during new moons and full moons -- the spring tides. Alternately, when the sun and moon are located at 90 degrees with respect to the earth, the sun and moon pull along different axes, and cancel each other out to some degree; this is what occurs during quarter moons, when tides vary far less than at other times of the month... not so high and not so low.

There is also a proxigean spring tide, an extremely high tide that occurs very rarely when the moon's orbital eccentricity also magnifies these gravitational tidal effects. This occurs when the moon's lowest point of orbit (proxigee) coincides with a full or new moon (already very high tides).

Incidentally, lunar phases are not caused by the earth's shadow falling on the moon. This would be an eclipse, which is quite rare.

What is cresant moon?

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First of all to correct your spelling. It is 'Crescent'. NOT 'cresant'.

A crescent moon is a phase of the Moon when less than half of the Moon is lit by the Sun , as seen from the Earth. It appears as two circular arcs nesting inside one another; that come to two points (top & bottom). During the Moon's monthly orbit of the Earth, you will see two crescent Moons. One is in the evening , when the Moon is between New Moon and 1st. Quarter. This is a WAXING CRESCENT Moon. The Second is seen in the morning, when the Moon is between Last Quarter and the next New Moon. This is a WANING CRESCENT Moon.

The Moon shows two other faces, between 1st Quarter and Full Moon and between Full Moon and Last Quarter. At these two positions it appears to be not quite circular. It is known as a WAXING/WANINGH GIBBOUS Moon.

Moonlight is the light reflecting from the?

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From the Sun.

Since the moon's surface is grey/white in colour , with darker pataches, it reflects sun light, which can be quite bright.

How long does it take to make one revolution around the earth?

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The Earth makes ONE revolution on its axis every 24 hours, its called 'a day'.

The Earth also makes one orbit about the Sun , it takes 365 days to do this, its called 'ONE year'.

To make one revolution around the Earth???? If you are a traveller on the Earth's surface, then by flying an aeroplane / AIR liner. would probably take about 2 days.

The effect of the moon on earths ocean?

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The main effect is the tides.

There are two high tides in slightly more than a day and two low tides in slightly more than a day .

The mean time between high and low tides is 6 hours 22 min and few seconds.

This odd amount of time is caused by the Moon's orbiting the Earth.

Compound this with the Sun's effect on the tides. When the Sun , Moon and Earth are in line we have Spring Tides and when the Sun Moon and Earth are at first/last quarter we have Neap Tides. This is because of gravitational pull is in different directions. Also the High tides is on the side of the Earth where the moon is. However, there is a corresponding high tide on the opposite side of the Earth; it like the balancing effect of a wheel.

THere is also a 'drag' effect on tidal height. The highest/lowest Spring tides come may a day ot two after the New/Full Moon. Similarly for Neap Tides.

Also in March and September at the equinoxes Sring tides are higher and lower that at the Soltices. Again it due to the Moon;s position at these points in the year.

How the moon appears to change its shape?

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The Moon changes it apparent shape due to its position, with respect to the Sun and the Earth, and its own shadow.

New Moon ; Total Black disc as it obscures the suns light ; Solar Eclipse.

1st Quarter ; Half in sun light ( seen) ,and half in shadow ( Moon's night). It is at right angles with respect to the Sun and Earth.

Full Moon; Totally lit ,by thew Sun ; Possibly Lunar Eclipse. Full lunar day time. It is in a line Sun Earth, Moon.

Last Quarter ; Half in sun light ( seen) ,and half in shadow ( Moon's night). It is at right angles with respect to the Sun and Earth. However, the shadow is on the opposite side.

Then back to the next New Moon.;

NB As an experiment, have a totally darkened room. A pin point beam of light and two different sized balls. The larger is the Earth and the smaller is the Moon. The pin-point light is the Sun.

Place them in the following order; light , small ball , larger ball. Look from behind the large ball to the light, The small ball will be black.

Replace as light , large ball , small ball a right angles , and look from the large ball to the small ball ; half lit.

Replace as light , large ball, small ball. Look from behind the light, the small ball is fully lit.

Finally, replace as light , large ball , small ball a right angles , and look from the large ball to the small ball but on the opposite side ; half lit.

That's the Moon's motion around the Earth, and hopefully it shows you why it is lit by different angles/amounts.

NB Solar and Lunar Ecliopses do not occur at every New / Full Moon because the Moon 'wobbles' up and down along its orbital track about the Earth.

Hope that helps!!!!

How strong is the gravitational force on earth?

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The force that the planet Earth applies on an object(the force is also called weight) depends on the mass of the object. It is not constant. The formula is:

Weight = mass x acceleration due to gravity

Acceleration due to gravity has a constant value on Earth: 9.81 m s-2

However, it is not constant everywhere in the universe. It depends on the planet you are on. Mass, however, is constant.

Does the moon come out in daylight?

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YES!!!

However, by comparison with night time it is much fainter. This is because Sun lights is much brighter. You see the Moon because it is reflecting Sun light.

In the day time the Moon's shape will be crescent.