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Every time four protons are turned into a helium nucleus, two neutrinos are produced. These neutrinos take only two seconds to reach the surface of the Sun and another eight minutes or so to reach the Earth. Thus, neutrinos tell us what happened in the center of the Sun eight minutes ago.

I turned my attention for a while to gamma ray astronomy and soon began the first in a continous series of experiments at the Savannah River site to study the properties of the neutrino.

You're going very fast when you're on orbit, going around the world once every hour and a half.

With every inch of land on Earth now catalogued by our satellites, the stars are the next place we as a species must travel. And with a booming world population that will hit 9.1 billion in 2050, large-scale space travel may become a necessity.

It's feasible that we'll meet other sentient life forms and conduct commerce with them. We don't now have the technology to physically travel outside our solar system for such an exchange to take place, but we are like Columbus centuries ago, learning fast how to get somewhere few think possible.

I follow the universe; I follow G-d. G-d made the sun, and the sun shines on everyone.

I really have become convinced that nuclear fusion is our energy future. It's so powerful. I mean, it is the power of the stars. If we could bring that down to the laboratory and to the power plant on Earth, that would be an incredible thing.

It's time for the human race to enter the solar system.

Every day I am on this Earth, I will do all I can for so many important causes.

Perhaps one day I will go into space.