David Grinspoon Quotes

The surface of Mars is bathed in ultraviolet light, bathed in radiation. Mars's magnetic field is essentially gone, so the surface of Mars is essentially sterilized.

One of the major problems with long-term deep space human flight is the requirement for radiation shielding.

Human beings are fragile things, and for the period of time it takes to get them to Mars and back, you have dangerous radiation from the sun and the galaxy. We have to think about issues like that.

If you go on a journey to Mars and get into deep space, there is several hundred times, maybe 300 times the radiation.

The investigation into the possible effects of cosmic rays on living organisms will also offer great interest.

It took me 45 minutes to get in all of the suits and putting all the dosimeters on me so that they knew how much radiation I got and the protective boots and everything.

It never ceases to amaze me that every second of every day, more than 6,000 billion neutrinos coming from nuclear reactions inside the sun whiz through my body, almost all of which will travel right through the earth without interruption.

The worst situation with radiation escaping is if you are downwind from it. You could virtually be on one side and not affected by the radiation. If you're on the other side and you're downwind from it, you are going to be affected.

Mars is much closer to the characteristics of Earth. It has a fall, winter, summer and spring. North Pole, South Pole, mountains and lots of ice. No one is going to live on Venus; no one is going to live on Jupiter.

When I entered the field in July 1958 I believed what they told me about radiation risks. I spent much effort reducing the dose to patients in radiology.

There are allowable limits for radiation going - I mean there's radiation all around us. There's radiation from your television set. There's radiation from your computer. There's radiation actually occurring in the ground.

Earth as an ecosystem stands out in the all of the universe. There's no place that we know about that can support life as we know it, not even our sister planet, Mars, where we might set up housekeeping someday, but at great effort and trouble we have to recreate the things we take for granted here.

Sunspots are hubs of intense magnetic activity and they trigger solar flares that launch charged particles, X-rays, ultraviolet radiation and radio waves at the Earth.

There's a world of insights to be gained into human health and disease by understanding how gravity and space radiation influence biology.

Solar storms cause power outages. They pose a hazard to satellites. They might interfere with your GPS or send your compass a couple of degrees off course. But I don't think solar storms are a life-threatening event.

Now we notice that Mars doesn't have any atmosphere either and won't support life. In spite of the fact that it turns green and red and purple with the seasons, it doesn't support life.

One of the biggest concerns about going out beyond lower Earth orbit is the radiation. We find that exercise seems to counteract a lot of the negative effects of space flight, like bone loss and muscle atrophy and cardiovascular systems issues. We exercise two hours a day on the station, which is a huge hit out of your day. It's great for staying in shape, but you know, it cuts into the productivity of the crew and if you look at how expensive it is to get a crew into space, if we can keep them healthy and have them exercise, but spend less time doing it, we can get more done.

That planet has a considerable but moderate atmosphere. So that the inhabitants probably enjoy a situation in many respects similar to ours.

We are blessed with a place that is open to the universe and, despite this, supports this very thin envelope of air we call atmosphere, which holds just the right amount of oxygen for us to breathe.

Mars, therefore, is not only uninhabited by intelligent beings such as Mr. Lowell postulates, but is absolutely uninhabitable.

There is a growing body of evidence that radiation in excess of what the government says are the minimum amounts we should be exposed to are actually good for you and reduce cases of cancer.

The Sun, the hearth of affection and life, pours burning love on the delighted earth.

Illusions are to the soul what atmosphere is to the earth.

Climate change: Never before in history have human beings been called on to act collectively in defence of the Earth

The first human beings to land on Mars should not come back to Earth. They should be the beginning of a build-up of a colony/settlement, I call it a 'permanence'.