- Know
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- Nov 07, 2020
David Grinspoon Quotes
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- Last Updated on May 30, 2021
- New
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- Nov 07, 2020
I'm a strong advocate of new missions to Venus.
- Long
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- Nov 07, 2020
Earth is going to lose its oceans in the future, just as Venus did in the past. How long planets retain their oceans is a function of distance from the sun, all other things being equal.
- Environmental
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- Nov 07, 2020
I do comparative studies of climate evolution, and the interactions between planetary atmosphere and surfaces and their radiation environment, and try to understand the environmental factors that can affect a planet's habitability and how they change over time.
- Factors
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- Nov 07, 2020
Radiation is one of the important factors in evolution. It causes mutation, and some level of mutation is actually good for evolution.
- Protection
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- Nov 07, 2020
Mars does not have an atmosphere and does not have a magnetic field today, so the planet doesn't have the protection from radiation that our atmosphere and magnetic fields provide us on Earth.
- Earth
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- Nov 07, 2020
What I wonder most about the Anthropocene is not when did it start - but when, and how, will it end? Will it end? Or is it possible that our own growing awareness of our role on Earth can itself play a pivotal role in shaping the outcome toward one that we would desire?
- Cognitive
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- Nov 07, 2020
Now, humans have become a dominant force of planetary change and, thus, we may have entered an eon of post-biological evolution in which cognitive systems have gained a powerful influence on the planet.
- New
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- Nov 07, 2020
The story of our species is one of overcoming existential risk through new forms of cooperation and innovation.
- Earth
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- Nov 07, 2020
You cannot study other planets without referring to Earth and without applying the techniques and the insights of Earth science. And you cannot really do a good job understanding the Earth without the insights from planetary exploration.
- Like
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- Nov 07, 2020
We're going to stop looking at Earth from orbit because we don't like what we are seeing and the conclusions that leads us to? That's nonsense.
- Lead
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- Nov 07, 2020
If we gutted NASA Earth Science, it wouldn't be NOAA or some other agency that would take the lead. It would be the Chinese and the Europeans and the Japanese.
- Life
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- Nov 07, 2020
There are other planets besides the Earth and Mars. I'd like to remind you that studying Venus is vital to understanding life elsewhere.
- Commonly
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- Nov 07, 2020
There was a long history of people believing there was life on Venus. It was about the same size as Earth. It had clouds. It was commonly believed it was tropical - wet, hot and steamy.
- People
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- Nov 07, 2020
I think a lot of people interested in space exploration tend to hear stories about the great missions, how they work technically, what we learned. But they don't really hear the story of what it takes to get a mission from scratch to the launch pad and into space.
- Possible
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- Nov 07, 2020
I think Pluto has to be considered among the places in the solar system that are possible homes for life.
- Like
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- Nov 07, 2020
What we should really be thinking about is what it would look like for a truly intelligent technological species to be interacting with their planet's atmosphere.
- Good
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- Nov 07, 2020
The basic ability to not wipe oneself out, to endure, to use your technological interaction with the world in such a way that has the possibility of the likelihood of lasting and not being temporary - that seems like a pretty good definition of intelligence.
- Go
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- Nov 07, 2020
We definitely don't want to go through another Ice Age or another natural cycle of global warming. Both happen over a long period of time. It would be disastrous for our civilization, and not just for us but many other species.
- More
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- Nov 07, 2020
I think that an advanced planetary civilization will modify their own planets to be more stable, to prevent asteroid impacts and dangerous climate fluctuations.
- Earth
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- Nov 07, 2020
Ever since the environmental movement was sparked by photos of the whole Earth taken by astronauts onboard Apollo Lunar Modules, I've seen planetary exploration as an extension of a reverence and care for Earth.
- Boston
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- Nov 07, 2020
I'd been politically active ever since my parents wheeled me in a stroller in a 'ban the bomb' march in Boston in 1963.
- Earth
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- Nov 07, 2020
NASA, and all the other spacefaring nations of the world, have agreed to a set of 'planetary-protection' principles, aimed at preventing the accidental contamination of another habitable world with organisms from Earth.
- Earth
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- Nov 07, 2020
Titan has rivers and lakes of liquid methane and ethane, methane weather systems of clouds and storms that mirror Earth's hydrologic cycle, and seasonal cycles that rival Earth's in complexity.
- Rise
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- Nov 07, 2020
If you were on the surface of Venus, assuming you could see the Sun, which, you know, would be hard because it's so cloudy there, but the Sun would actually rise in the west and set in the east. And, it would do so very, very slowly, because the planet rotates incredibly slowly.
- Reading
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- Nov 07, 2020
A lot of the science fiction that I grew up reading was written when we still thought that Venus might be an oceanic planet.
- Dad
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- Nov 07, 2020
It turns out one of my dad's best friends was Carl Sagan when I was little. They were both Harvard professors.
- Memory
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- Nov 07, 2020
Literally, my earliest memory, my earliest vivid memory, is the Apollo 11 landing on the Moon. Yeah, I was in fourth grade, and I was just so captivated. And I think you'll find a lot of space scientists of my generation will say the same thing. Apollo was a big event for them.
- Life
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- Nov 07, 2020
I do a lot of work with NASA and am involved in research projects studying planetary evolution, Earth-like planets, and potential conditions for life elsewhere.
- Back
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- Nov 07, 2020
We've almost been wiped out as a species many times, going back millions of years, and we've survived by reinventing ourselves and enlarging our circles of awareness, inventing new technologies and social structures.
- Fossil
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- Nov 07, 2020
We're going to get off fossil fuels, no question. We may not do it quickly enough to avoid some pain, and I'm quite worried about that. But by the 22nd century, there's no way we'll be on fossil fuels.
- Earth
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- Nov 07, 2020
Even as our unwitting alterations to Earth's carbon and hydrological cycles slowly make storms more damaging, our ability to monitor our planet from space and make reliable short-term forecasts have equipped us enormously to withstand them.
- Hard
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- Nov 07, 2020
Humans are possessed, to some degree, with the power of foresight. Yet we so often learn things the hard way, through disaster.
- Challenges
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- Nov 07, 2020
Thinking about the new epoch - often called the Anthropocene, or the age of humanity - challenges us to look at ourselves in the mirror of deep time, measured not in centuries or even in millennia, but over millions and billions of years.
- Earth
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- Nov 07, 2020
Humanity has at least a dim, and growing, cognisance of the effects of its presence on this planet. The possibility that we might integrate that awareness into how we interface with the Earth system is one that should give us hope.
- Live
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- Nov 07, 2020
The mature Anthropocene begins when we acquire the ability to live sustainably and become a lasting presence on this world.
- Beast
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- Nov 07, 2020
Responsible global behaviour is ultimately an act of self-preservation of, by, and for the global beast that modern technological humanity has become.
- Live
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- Nov 07, 2020
Once we become a multiplanet species, our chances to live long and prosper will take a huge leap skyward.
- More
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- Nov 07, 2020
The future peopling of Mars is much more than a scientific endeavor. It is a step of historic and spiritual importance for the human race.
- Forward-Looking
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- Nov 07, 2020
My high-school friends and I felt part of a community of smart, forward-looking space and technology freaks.
- Earth
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- Nov 07, 2020
Whenever I see a nighttime picture of Earth from space, with its glowing lights, I am stirred by its beauty.
- Earth
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- Nov 07, 2020
Earth is a stunningly lovely planet for so many reasons. Among these is the wondrous presence of curious, artful, inventive humanity.
- Nothing
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- Nov 07, 2020
There is a real danger of unintended consequences, of encouraging people to give up. Pessimism, if it becomes a habit, can reinforce a narrative of unstoppable decline. If there is nothing we can do, that releases us from our obligations.
- Future
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- Nov 07, 2020
As long as we can imagine a better path, of course we are obligated to seek it. This is why unwarranted pessimism about our future is actually irresponsible.
- Earth
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- Nov 07, 2020
Why should we consider defining intelligence as something global and as something that hasn't actually yet appeared on Earth? It may be useful for envisioning the future of our own civilization and any others that may be out there among the stars. It might give us something to strive for.
- Destiny
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- Nov 07, 2020
Part of the point of SETI has always been a search for answers about our own cosmic potential and destiny. If 'they' are out there, it means that there may be hope for us.
- Intelligence
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- Nov 07, 2020
Among the radio astronomers of SETI - the Search for Extraterrestrial Intelligence - it's only sort-of a joke that the true hallmark of intelligent life is the creation of radio astronomy.
- Good
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- Nov 07, 2020