why dont astronauts go to other planets?

Question

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Answer 1

Some planets are hostile toward our bodies; otherwise planets and moons in our solar system are accessible. $$$ can solve this, and someone's vision.

Answer 2

It's partly money, but also i think it's to do with a change in attitude since the Moon landings. People are more inward-looking, which results in things like excessive concern for safety and preoccupation with things that are going on inside organisations or their own minds. To be fair, it would carry a big risk with it, particularly because of the exposure to radiation between Earth and the other planet. Shielding would be possible, but this would increase the mass of the spaceship enormously and mean too much fuel would be needed. At the other end, there might be problems leaving the planet and there are specific problems with each.

Venus would be easiest to do provided all the spacecraft did was orbit Venus rather than try to land people on it. It's the closest, so there would be less risk from radiation (although there would be more) and it wouldn't take as long so supplies would be lower.

Mars would be somewhat harder but it would be possible to land. It would take longer.

The problem with Mercury would be the heat of the Sun, which could be remedied by some kind of heat shield moving in front of the probe. Energy would be plentiful. Astronauts could land during the night or at the poles. The crater Chao Meng-Fu might be a good choice.

Some asteroids pass very close to the Earth on occasion. With good planning, this could be done right now. These are by far the easiest, and they could possibly also be used as bases between planets, so rather than actually flying a spaceship to the planet, people could choose an asteroid which would pass close to the Earth and another planet, fly to the asteroid, stay on it until it was near the other planet, then fly to that planet. This could save fuel.

Jupiter's moons would be more difficult. The biggest ones orbit the planet inside intensely radioactive zones around it, and Callisto would be the only one which was at all safe. They are also very far away indeed.

Saturn's moons are more hospitable but even further away. Titan is particularly friendly because of the surface pressure, but it is very cold.

Uranus and Neptune are so far away it will be a long time before people go there, if they ever do.

Answer 3

Because it would take better science than we have available at this time to do so with any degree of safety. The only planet an astronaut could visit would be Mars.

Its also very distant and the mission would likely take more than a year.

Answer 4

Most (if not, All) the other planets don't have a sufficient enough amount of oxygen in their atmostpheres to allow humans to survive on their surface. The trip getting to the planets would be extreemly long and you would need a LOT of food for the astronauts to eat, and the other planets overall aren't that habitable, as they are either super hot, super cold, full of storms, or just plain old uninhabitable (too much solar radiation radiation gets to their surfaces...those sort of unknowns most people take for granted/don't even know about.)
Mars is being talked about as the next place to land and even try to inhabit, but when that will happen is still yet to be seen as there are many concerns about safety and supplies.

Answer 5

Distance is somewhat of a problem.

Carrying Sufficient Fuel is another problem.

In your question, are you asking about "GOING"?
or are you asking about "GOING AND COMING BACK?"
That is two different questions.

The Moon circles the Earth at a distance of
239,000 Miles.

Mercury orbits the Sun at a distance of 36,000,000 Miles.
The Earth orbits the Sun at a distance of 93,000,000 Miles.
So the distance from Earth to Mercury varies from
57,000,000 Miles (closest approach) to 129,000,000 Miles when the two planets are fartherest apart on opposite sides of the Sun. Temperatures on Mercury are Minus 292 Degrees F to Plus 806 Degrees F - not a very hospitable place.

Venus orbits the Sun at a distance of 67 Million Miles.
The Earth orbits the Sun at a distance of 93 Million Miles.
So the distance between Earth and Venus varies from
26,000,000 Miles (closest approach) to 160,000,000 Miles
when the planets are on opposite sides of the Sun. The surface temperature on Venus is Plus 867 Degrees F. Violent storms are natural on the planet as is sulphuric acid rainfall into the mainly carbon dioxide atmosphere. Hot Acid showers do not sound very appealing to me.

Mars orbits the Sun at a distance of 141.6 Million Miles.
The Earth orbits the Sun at a distance of 93 Million Miles.
So, the distance between Earth and Mars would be
48,600,000 Miles at the closest approach, and 234,000,000 Miles when the two planets were fartherest apart (opposite sides of the Sun. There is a minimal atmosphere on Mars (certainly not breathable) and temperatures there vary from Minus 195 Degrees F to Plus 77 Degrees F. This one is a possible to visit.

Jupiter, Uranus, and Saturn are gas giants with no solid surface to land, travel or walk upon. So expeditions there would never be able to land and accomplish much. And by now you get the idea of how far away some of these objects are from Earth residents.

Answer 6

It takes too long and we do not have any space craft that support astronauts that long in space without needing resupply or repair. Also, no operational manned space craft at this time has enough rocket power to leave Earth orbit. The one and only space craft ever built that could carry people AND that had enough rocket power to leave Earth orbit was Saturn-Apollo, and that program was canceled in the 1970s.

Answer 7

We don't yet posses sufficent technology and resources to send manned spacecraft the distance necessary to reach other planets. Humans are obviously inclined to pursue this, so we can expect these to be developed eventually, probably within the next 15 to 30 years based on how things seem to be going currently.

Answer 8

Because you are not willing to pay twice as many taxes. Other planets wouldn't be a problem with half a trillion $$$ funding a year.

:-)

Answer 9

So that they can study the atmosphere, soil etc. of that planet.

Answer 10

1) the cost of sending someone anywhere in space is pretty high, and
2) it would take years and years for them to get there, much less get back.