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Compared to coal, which generates almost half the electricity in the United States, natural gas is indeed a cleaner, less polluting fuel. But compared to, say, solar, it's filthy. And of course there is nothing renewable about natural gas.
I felt like I might as well have been living in another part of the solar system.
The Venus transit is not a spectacle the way a total solar eclipse is a spectacle.
Neil deGrasse Tyson
Mars is the only place in the solar system where it's possible for life to become multi-planetarian.
An enormous amount of scientific language is metaphorical. We talk about a genetic code, where code originally meant a cipher; we talk about the solar system model of the atom as though the atom were like a sun and moon and planets.
It's very dangerous to put astronauts on a moon base where there's radiation, solar flares and micro meteorites. It'd be much better to put robots on the moon and have them mentally connected to astronauts on the Earth.
The planets and moons of our solar system are blatantly visible because they reflect sunlight. Without the nearby Sun, these planets would be cryptic and dark on the sky.
Estimates are that at least 70 per cent of all stars are accompanied by planets, and since the latter can occur in systems rather than as individuals (think of our own solar system), the number of planets in the Milky Way galaxy is of order one trillion.
The Moon is a ball of left-over debris from a cosmic collision that took place more than four billion years ago. A Mars-sized asteroid - one of the countless planetesimals that were frantically churning our solar system into existence - hit the infant Earth, bequeathing it a very large natural satellite.
The cosmos is three times as old as Earth. During most of creation's 14 billion year history, our solar system wasn't around. Nonetheless, the early universe still had the right stuff for life, and contained worlds that were just as suitable for spawning biology and intelligence as our own.
We live in a world bathed in 5,000 times more energy than we consume as a species in the year, in the form of solar energy. It's just not in usable form yet.
Just think: in all the clean, beautiful reaches of the solar system, our planet alone is a blot; our planet alone has death.
I drive a hybrid, and we've changed our light bulbs and windows and installed solar panels and geothermal ground source heat pumps and most everything else.
I hope that by 2050 the entire solar system will have been explored and mapped by flotillas of tiny robotic craft.
In future, children won't perceive the stars as mere twinkling points of light: they'll learn that each is a 'Sun', orbited by planets fully as interesting as those in our Solar system.
There are lots of ideas which extend the Copernican principle one step further. We went from the solar system to the galaxy to zillions of galaxies and now to realising even that isn't all there is.
Look at countries like China, they are determined to dominate all clean technology areas, putting lots of money into wind, solar, electric vehicles and battery storage. America's political impotence, caused by their terrible partisanship, will see them left behind.
There's life all over this universe, but the only life in the solar system is on earth, and in the whole universe we are the only men.
If I were to do a foundation, it would be to promote solar energy. And I'm worried about drilling for oil. I think it is harming the earth, 'cos it drains the layer of oil under the surface, and that could be causing earthquakes. It's like we're giving the earth arthritis. I don't know if that sounds crazy.
All of this got me thinking about the history of the westward expansion, and got me to wondering how the exploration of the Solar System would be changed if there were an indigenous presence out there.
Today, President Obama is making smart investments in clean energy - wind, solar, biofuels - as part of an all-of-the-above energy strategy that supports thousands of jobs, not in the Middle East, but in the Midwest.
It's important to understand that oil and renewables do different things. Wind and solar are for power generation, so they don't replace oil. About 70% of all oil produced is used for transportation fuel. Renewables are good projects, but they don't get us off of foreign oil.
T. Boone Pickens
I ride my bike for transportation a great deal - occasionally I ride it for fun. But I also have a generator bike that's hooked up to my solar battery pack, so if I ride 15 minutes hard on my bike, that's enough energy to toast toast, or power my computer.
Ed Begley, Jr.
I assume we will have figured out a way to efficiently utilize solar energy and tied that to an efficient way to use nuclear energy in such a way that it doesn't pose a serious environmental issue.
Dark energy is incredibly strange, but actually it makes sense to me that it went unnoticed, because dark energy has no effect on daily life, or even inside our solar system.
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