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What Will Happen to Earth When the Sun Dies? Stars are born, they live, and they die.

What Will Happen to Earth When the Sun Dies?

The sun is no different, and when it goes, the Earth goes with it. But our planet won't go quietly into the night. The 12 Greatest Challenges for Space Exploration. Humanity began in Africa.

The 12 Greatest Challenges for Space Exploration

But we didn’t stay there, not all of us—over thousands of years our ancestors walked all over the continent, then out of it. And when they came to the sea, they built boats and sailed tremendous distances to islands they could not have known were there. JFK - We choose to go to the Moon, full length. Why we can't send humans to Mars yet, and how we'll fix that. While humans have dreamed about going to Mars practically since it was discovered, an actual mission in the foreseeable future is finally starting to feel like a real possibility.

Why we can't send humans to Mars yet, and how we'll fix that

But how real is it? Nasa says it's serious about one day doing a manned mission while private companies are jockeying to present ever-more audacious plans to get there. Five Problems With Sending Humans to Mars — SpaceBounder. High doses of cosmic and solar rays can have adverse affects on the central nervous system, such as: impaired cognitive function and motor skills, behavioral changes, and a slightly increased risk of developing fatal cancer at some point in any given astronaut's lifetime.

Extreme exposure could potentially lead to radiation sickness, and symptoms which include nausea, vomiting, fatigue, and loss of appetite. NASA currently holds the position that any spacecraft heading for Mars with a human crew on board will need to incorporate an increased amount of radiation shielding—the more the better. But with added shielding comes added weight to the spacecraft, and every added kilogram could prolong the journey to Mars, leaving astronauts exposed to cosmic and solar rays for even longer periods of time.

Further reading: "What were you saying about that deadly space radiation? Here are the facts. " Why Is It So Hard to Travel to Mars? The Challenger and Columbia space shuttle disasters were perhaps two of the most prominent reminders of how crucial it is that everything work just right for a spacecraft to travel to space and successfully return back to Earth.

Why Is It So Hard to Travel to Mars?

Whether it was the failure of the seal used to stop hot gases from seeping through, or a piece of foam insulation that damaged the thermal protection system, scientists and engineers must make thousands of predictions of all the things that could go wrong during flight. NASA's human Mars mission presents even more challenges of sending humans safely to a farther distance and to a more dangerous environment. Designing an aircraft that can safely enter and exit Mars' unpredictable atmosphere is a big challenge. [Gallery: Future Visions of Human Spaceflight] "Each time we fly to Mars, we learn a little more and get a little smarter," said Walter Engelund of NASA's Langley Research Center. Spotlight. Two out of three missions to the red planet have failed.

Spotlight

One reason there have been so many losses is that there have been so many attempts. "Mars is a favorite target," says Dr. Firouz Naderi, manager of the Mars Program Office at the Jet Propulsion Laboratory. "We -- the United States and former USSR -- have been going to Mars for 40 years.