Why is it that man can travel to space but can't travel deep down the Marianas trench?

Answer 1

There are actually problems that make deep sea exploration harder than space travel. Others have hit the PSI problem well.

Another difficult problem is communications ... electromagnetic radiation, which is used in radio communication, travels beautifully through empty space, but does not travel very far through water. It is actually easier to communicate with a space probe flying past Jupiter than it is to communicate with a submarine at the bottom of the ocean.

But perhaps the biggest issue is money. When you say "man" ... don't lose track of the fact that space exploration is funded by national governments, whereas deep sea exploration (other than military use) is more privatly funded by research institutes. There is a lot of national pride, and other interests (like military, or communications) that give a country reasons to fund space exploration ... but few countries see a big benefit from exploring the Marianas trench.

Answer 2

It is possible to travel in some of the modern submersibles to
the depths of the Marianas Trench. I believe it has already been done, though not very often. Much of the recent deep-
sea exploration has been concentrated around the volcanic
vents that have chemosynthetic bacteria in abundance. These areas are like oases on the sea bottom, and many new kinds of organisms have been discovered near therm.

Answer 3

Inside a space suit the pressure is about 7psi so difference in pressure is 7-0=7psi
In the deep the outside pressure can be 10,000psi.
inside pressure =14-28 psi outside pressure 10,000psi
Pressure difference is still nearly 10,000 psi.

Answer 4

Pressure

Answer 5

going that deep in water is far more cost prohibitive than into space actually. the amount of force exerted on the surface of a vessel going that deep is absolutely huge. we can withold that kind of pressure inside a piping system because of the smaller surface area inside the piping.

Answer 6

With space we had to overcome propulsion and navigtion issues which we have made discoveries to overcome. To venture into the Marianas trench issues of pressure have to be overcome and it is either too expensive with not enough payoff currently to do so, or we need to find materials suitable for the job.

Answer 7

We probably have and for security reasons it has not been broadcast.
There are lots of things kept back from the public.
For example all those 'secret' subterranean towns built to house 'important personnel' in the event of a nuclear war.

Answer 8

pressure. we exist at about 14pounds per square inch.
in space if the pressure is 0, the difference between our normal and space is 14psi.
the deepest dive in history by piccard and walsh was almost 36,000 ft down, at a pressure difference of about 1100 times 14psi

Answer 9

havent you heard...we dont really do that....we use the same set from space balls to show lunar landings and flights to space....

Answer 10

But it's so creepy down there! and all those nasty sea creatures that people never see... no thanks.