Has man really landed on the moon? , because my school teacher told me that nothing can escape the earth's gra

Answer 1

To pull away from the Earth's gravity , the space vehicles are

programmed to attain what is called 'ESCAPE VELOCITY'.

To escape the Earth's Gravity and go in to the space the escape

velocity is 11.2 kilometers per second.

If the space vehicle has this velocity it WILL escape from the

earth and move in the direction of the other planets.

On the other hand the Moon is much smaller than the earth and

to escape its gravity , the space shuttle need to attain only a

speed of about 2 Kilometers per second.

So your teacher is not 100% correct.

Answer 2

i think i know what your teacher is refering to. some people exagerate the effects/amount of radiation between the earth and the moon. some believe that we could not survive without 1 foot of lead surrounding the astronauts. this would probably cause issues achieving escape velocity as the capsul would be very heavy. but as written below, the immediate effects would not be deadly



Radiation is a big problem when it comes to space travel and the Earth's magnetic field concentrates this radiation into the Van Allen belts that surround the Earth. No matter what, the Apollo crafts had to go through these belts and there was no way the Apollo crafts could afford to take all the weight of lead shielding with them. So they were bound to be exposed. The question is, just how serious would this exposure be?

What you have to realize that the radiation involved isn't the same kind or intensity as you might get from a nuclear bomb. You don't fall sick and your hair doesn't all fall out. It's been calculated that travelling at speed through the Van Allen belt would result in exposure of 1 rem. Radiation sickness symptoms don't start to show until you get around 25. Once you reach 100 you're going to be ill. 500 and you're probably dead. So the exposure the astronauts received is pretty mild.

But that isn't to say either that it can't do you any harm. Added to the exposure they got actually out on the moon, it is a risk that can't be fully quantified. Who knows what cancers could result from it? Given the choice most people would want to avoid this kind of exposure to radiation. But the astronauts risked it because they thought it was worth it. This, and all the other risks they faced, is what makes them remarkable people.

Answer 3

1) Twelve 12 American astronauts have walked on the moon.

Apollo 11: Neil Armstrong & Buzz Aldrin
Apollo 12: Pete Conrad & Alan Bean
Apollo 13: << failed to land on the moon >>
Apollo 14: Alan Shepard & Edgar (Ed) Mitchell
Apollo 15: David Scott & James Irwin
Apollo 16: John Young & Charles Duke
Apollo 17: Eugene (Gene) Cernan & Harrison Schmidt


2) Why haven't we been back?

a) American astronauts visited the moon on six occasions.

b) The "moon race" was an extension of the cold war. It was mostly about national prestige. We got there first and achieved our primary objective. There was some good science: surveys, measurements, sample collection. But it was mostly about being there first. Once we achieved our primary objective, there was no political will to go back. There still isn't. Perhaps, if we discover He3 or something else valuable, there will be.

c) I used to travel to Crested Butte, Colorado every year to ski. Because I don't go anymore, does it mean that I never went?


3) What about the Van Allen radiation belts? Wouldn't it have killed the astronauts?

The existence of the Van Allen radiation belts postulated in the 1940s by Nicholas Christofilos. Their existence was confirmed in *1958* by the Explorer I satellite launched by the USA.

The radiation in the Van Allen radiation belts is not particularly strong. You would have to hang out there for a week or so in order to get radiation sickness. And, because the radiation is not particularly strong, a few millimeters of metal is all that is required for protection. "An object satellite shielded by 3 mm of aluminum will receive about 2500 rem (25 Sv) per *year*."

"In practice, Apollo astronauts who travelled to the moon spent very little time in the belts and received a harmless dose. [6]. Nevertheless NASA deliberately timed Apollo launches, and used lunar transfer orbits that only skirted the edge of the belt over the equator to minimise the radiation." When the astronauts returned to Earth, their dosimeters showed that they had received about as much radiation as a couple of medical X-rays.


4) The U.S. government scammed everyone?

In 1972, there was a politically motivated burglary of a hotel room in the Watergate Hotel in Washington, D.C. There were only about six or eight people who knew about it. However, those people, including Richard M. Nixon, the President of the United States, failed to keep that burglary a secret. It exploded into a scandal that drove the President and a number of others from office.

If six or eight people couldn't keep a hotel room burglary a secret, then how could literally thousands of people could have kept their mouths shut about six faked moon landings? Not just one moon landing, but six of them!


5) What about the USSR?

Even if NASA and other government agencies could have faked the six moon landings well enough to fool the general public, they could NOT have fooled the space agency or military intelligence types in the USSR. The Soviets were just dying to beat us. If the landings were faked, the Soviets would have re-engineered their N-1 booster and landed on the moon just to prove what liars Americans are. Why didn't they? Because the landings were real and the Soviets knew it.


6) Why does the flag shake? Where are the stars? Who took the video of Neil Armstrong?

Take a look at the first two websites listed below. They deal well with all of the technical questions.


7) Finally, please tell us what you would accept as definitive evidence that the six moon landings were real. Is there anything?

Answer 4

Either your teacher is an idiot, or you misunderstood what he or she said. Either could be true--certainly a number of my teachers were idiots.

Man-made objects frequently escape the earth's gravity, and some have travelled entirely outside of the solar system.

And yes, we did really land on the moon. I was 22 years old and my girlfriend and I watched it on a black and white TV set on the back porch. We all knew then that it was really happening. Some people question it, because the technology required to fake something like that exists NOW. But it didn't exist THEN. We knew it was for real.

Yes, we did go, and yes, it is relatively easy to escape the earth's gravity.

By the way, I know I have a female avatar, but I am a man. My girlfriend in 1969 was 18, and really cute.

Answer 5

Your school teacher is freaking me out. it is like the blind leading the blind.

Of course things can escape earth's gravity, provided they have enough oooomph.

Have a look on the JPL nasa site (below) and read about Voyager 1 and Voyager II. These are the furthest man made objects from earth so far.

Man did go to the moon, however we do lack the powerful rocket technology of the saturn launchers that took people there back in the 1960's.

Answer 6

To the extent that gravitational fields are not well understood, and that it appears that every mass in the universe has a gravitational field which extends in every direction until eternity, your school teacher is in fact correct. Even on the moon, the Earth's gravity will affect you. I mean to say, the sun's gravity is what keeps the Earth in orbit, but it doesn't pull us off the Earth. The moon's gravity creates the tides in the oceans. So, YES it is impossible to escape the Earth's gravitational field. HOWEVER that does not prevent us from going to the moon, nor prevent us from going into space.

Answer 7

Man definitely has landed on the moon.

The rockets that got us to the moon did so by reaching escape velocity for the earth (about 7 miles per second). They had to turn around and use their rockets to slow down, or else they would have sailed away forever.

Note that the moon is held in orbit around the earth by gravity!

In fact, the pull of gravity is infinite in extent - you could be on the other side of the universe, and the earth would theoretically still exert a gravitational force on you - of course it would be a tiny tiny one.

The Pioneer and Voyager space probes are now out beyond the orbit of Pluto - they are escaping from the entire solar system. Once you reach escape velocity, the pull of gravity can never slow you down and pull you back by itself. That is why it is called the 'escape velocity'.

The escape velocity at earth's surface is 7 miles per second. From the position of earth's orbit, escape velocity for the solar system is much higher at 27 miles per second. However, the earth is already moving at almost 19 miles per second in its orbit, so if you leave the earth's heading in the right direction, you only have to be accelerate an extra 8 miles per second to have achieved solar-system escape velocity.

If you were at the surface of the sun, the gravitational well is much deeper, and the escape velocity from there is 380 miles per second.

The escape velocity for the Milky Way, from the position of our solar system, is higher again at about 600 miles per second. That is how fast you would have to be going to leave our galaxy and travel to another one. Of course, the journey would take a rather long time!

Answer 8

Escape Velocity.

Answer 9

Did you watch the video of the astronaut landing on the moon?? If things couldn't escape the earth's gravitational pull ....how would space shuttles get up there to fix that satellitle???

Answer 10

You can escape Earth's gravity by reaching a speed of 7 miles per second. That's why we have rockets.