Tomorrow NASA will whack the moon

On nous a appris a l'ecole que la Lune et la Terre sont liees depuis la nuit des temps et ont une influence sur les marees et meme les saisons; et si ce bombardement enclenche un decentrement de la Lune de son orbite, ce sera une experience interessante, non....

Je n'y crois pas que c'est pour trouver de l'eau. Que cache ce bombardement?

En plus de quel droit se permit-on de perturber l'equilibre cosmique?

kami a écrit:On nous a appris a l'ecole que la Lune et la Terre sont liees depuis la nuit des temps et ont une influence sur les marees et meme les saisons; et si ce bombardement enclenche un decentrement de la Lune de son orbite, ce sera une experience interessante, non....

Je n'y crois pas que c'est pour trouver de l'eau. Que cache ce bombardement?

En plus de quel droit se permit-on de perturber l'equilibre cosmique?

Que de nouvelles connaissances ont pris le contrepied d'un tas de detritus qu'on nous a fait apprendre a l'ecole. S'il n'existe pas d'habitants sur la lune, quel serait la raison autre que la recherche de l'eau, matiere qui changerait le cours des experiences de l'homme dans l'espace, ou la lune serait une station "vivable"? Ce que nous savons c'est que l'eau est une matiere tres lourde a transporter en espace. Nous savons que les crateres lunaires ressembles a ceux qui sont sur terre qui ont de l'eau a quelques centaines metres ou kilometres de profondeur. Savons nous aussi bien que cette explosion ne changera rien dans l'equilibre cosmique, elle ne represente meme pas une goutte d'eau dans l'ocean. Alors, ou en sommes nous? Peut etre qu'elle changera les predictions astroligiques ou le lion deviendra un taureau bande a l'arriere, qui sait?

kami a écrit:

On nous a appris a l'ecole que la Lune et la Terre sont liees depuis la nuit des temps et ont une influence sur les marees et meme les saisons; Dilibon a écrit: Que de nouvelles connaissances ont pris le contrepied d'un tas de detritus qu'on nous a fait apprendre a l'ecole.

What does the Moon have to do with ocean tides?
What an "attractive" question! The Moon and the ocean share a mutual gravitational attraction; so, the Moon helps tides happen. When you first think about this, it makes perfect sense that the Moon's gravity tugs on the ocean enough to make a small bulge form in the sea below the Moon. As Earth turns, ocean shores pass through the bulge, and we observe tides.

Tidal tug-o'-war
The oceans account for a tad more than 0.02 percent of Earth's total mass. So, one might describe this as a small bulge. You can't really see it in, say, a picture from space. But, of course, it's enormous. The world ocean carries about 1.4 quintillion tons (1.4 x 1018 tons, a billion-billion) of seawater. Those trillions of cubic kilometers of seawater are sloshed around easier than you can make a ripple in a bathtub. And, if you're sitting on an ocean shore, the tides are pretty easy to detect.

The Moon does some tidal tugging, but so does the Sun. When the Moon and Sun are in a line with Earth, the tides are higher. We call those spring tides. When they're at right angles in outer space, the tides are lower. We call those neap tides.

The Moon is much, much smaller than the Sun, about a hundred millionth of the Sun's mass. Its gravitational pull would be diminished by that enormous fraction, but the Moon is also much, much closer--about 400 times closer to Earth than the Sun. So, the Sun's tidal influence is about half (46 percent) of the Moon's.

Observe a lamp or streetlight. When you get twice as far away, the light is a quarter as bright. So it goes with gravity. (Gravity goes with 1 over the distance between objects squared.) The two enormous masses of the Sun and the Moon, positioned as they are at enormous distances, conspire to make tide times a bit complicated, but very predictable.

It's high tide somewhere
As you think about this tidal bulge for a few more moments, it may surprise you to realize that a second bulge in Earth's ocean forms on the side of the world farthest from the Moon. Along with gravity, Earth is spinning. (Uh ... thanks, Bill.) That spin causes the ocean to bulge as well. With no other influence, the ocean's bulges would be biggest near the equator and thinner near the North and South poles. But the bulge, due to Earth's spin, is in the grip of the Sun and Moon's gravity. As the saying goes, it's five o'clock somewhere. Well, the ocean is bulging high-tide-wise somewhere all the time as well--and on opposite sides of Earth. And the effect is more noticeable the farther you go from the equator, where the slopes of the bulges are steeper.

And there's more: The Moon orbits Earth all right, but the plane of its orbit is not the same as the plane of Earth's equator. Instead, the Moon's orbit is tilted. So think about this: Most of the time, one tidal bulge forms north of the equator, and the other tidal bulge on the other side of the world is south of the equator.

Furthermore, the Moon is going around Earth in the same direction that Earth is spinning. Earth has to turn an extra little bit, about 12 degrees of arc, to have the Moon in the same position relative to any given place on Earth. So, the tides nominally lag behind our 24 hours of daylight by about 50 minutes. This all adds up and has to be taken into careful account by algorithms created to predict tides, which are known as tide tables.

What's a tidal pool?
If you've ever wandered on the shore, if you've gone beach combing, as it's called, you've come across entire ecosystems that came to be because of the tides. In these intertidal zones, the beach is high and dry part of the day. At other times, the whole zone is underwater. So animals and plants that live there on the beach and in the tidal pools have developed ways to stay wet inside when it's dry outside. Sand crabs burrow. Barnacles close their shells up tight. When the tide is high and their world is wet, clams are filter feeders. They siphon water through their digestive systems, gathering tiny food particles from the flow. When the tide goes out, many clams close up tight. With no food available and no longer submerged, their shells protect them from predators. Clams came to be over billions of years, so they probably wouldn't bother with all this, if the Moon hadn't been up there tugging up the tide for quite some time. Shore birds come looking for a meal when the tide's out. For a few hours, they can see creatures of the sea exposed to the Sun. See?
The tides we measure on shore are affected by other factors as well: local seafloor shapes, runs of rivers, and which direction--west, east, south, or north--a beach faces. But it all starts in outer space. How mysterious it must have all been long ago, without belief in inverse square laws and massive distant objects beyond Earth. The Moon's gravity tugs up tides in the sea--part of the graceful dance of our spinning worlds.... Tides are science.

Source: Encarta

Pourquoi bombarder quand les indiens ont trouvés cela ?

pire encore, les USA le savent depuis 1976