What was the minimum speed for Apollo 11 to leave Earth?
about 7 miles per second
How fast was the Apollo mission?
The record for the fastest re-entry and, therefore, the record for the fastest speed ever attained by humans, goes to the Apollo 10 crew. In May 1968, they returned to Earth at 36,397 feet per second – that’s 24,816mph (39,705km/h). (You can hear more about Apollo 8.
How fast did the command module orbit the moon?
3,600 mph
Would a bullet orbit the moon?
The Moon is smaller and has less of a gravitational pull, so something orbiting the Moon doesn’t need to be going at such a high velocity. A very powerful gun, like a military cannon, would be able to fire a shot all the way around the surface of the Moon.
Why does the Apollo spacecraft not need rockets to slow down?
There is nothing to slow them down so the Command Module steadily increases its velocity, until it reaches 25,000 mph—the same speed they needed when they left earth in the first place.
Why is reentry so dangerous?
Reentry is also a dangerous phase of space flight. Part of what makes existing modes of reentry dangerous is that they are unpowered. Remember that speed that keeps a spacecraft in orbit? As it hits the air it heats up due to the friction of the air against the spacecraft surfaces.
Is it possible to re enter the atmosphere slowly?
It is easy to penetrate the atmosphere quickly, and burn up like a meteor. The problem is to enter slowly. You can do that too, but it would take a huge amount of fuel with ordinary rockets. To skim the Earth’s atmosphere in orbit, your spacecraft has to travel at least as fast as 7.8 km / second, or about 17,500 mph.
Why is it so difficult to leave Earth’s atmosphere?
Why is it so difficult to leave the earths atmosphere? Doesn’t gravity get weaker the higher up you go? Gravity is only a small part of your problem. Air also makes it much harder to climb at any reasonable rate of speed, but your main problems are the distances and speeds involved.
Why we Cannot see space?
The blue color of the sky is a result of this scattering process. At night, when that part of Earth is facing away from the Sun, space looks black because there is no nearby bright source of light, like the Sun, to be scattered. Yet we know from experience that space is black! This paradox is known as Olbers’ Paradox.
At what altitude do you escape Earth gravity?
11km/s
Why don’t we fall of the earth?
Fortunately for us, the earth has a lot of sideways momentum. Because of this sideways momentum, the earth is continually falling towards the sun and missing it. Scientists use fancy phrases for this effect such as “stable orbit” or “closed trajectory”, but fundamentally what they mean is “falling and missing”.
Will gravity ever stop?
The Earth’s gravitational field extends well into space it does not stop. However, it does weaken as one gets further from the center of the Earth. In fact, at 125 mi the gravitational field experienced by the astronauts is 94% of what they would experience on Earth!